MULTIPLYING GREATER NUMBERS

4TH GRADE

Review What You Know

multiple product factors round

1. One way to estimate with numbers is to ___________ each number.

2. A ____________ is the answer to a multiplication problem.

3. In the equation 9 x 5 = 45, the 9 and 5 are both ___________.

Rounding

Round each number to the place of the highlighted digit.

864 6,518 34,826

9,851 4,513,617 749,248

5,376,457 99,999 191,111,111

Multiplication

Find each product.

13 x 9 25 x 16 43 x 86

61 x 94 57 x 4 45 x 23

12 x 12 99 x 2 55 x 55

Suzi went to a craft fair and bought

3 quilts for $45 each and 3 sun-

catchers for $12 each. How much

did she spend?

How do you multiply 3-digit numbers

by 2-digit numbers?

Last month a bakery sold 389 trays

of bagels. How many bagels did the

store sell last month?

12 bagels per tray

Do You Know How ?

2 3 6

x 4 6

4 2 5

x 6 1

1 1 6

x 7 2

7 8 5

x 5 8

4 9 8

x 4 2

4 6 1

x 1 3

Do You Know How ?

7 6 3

x 1 9

5 1 5

x 3 5

6 2 9

x 4 7

1 8 5

x 5 5

2 2 7

x 8 7

9 4 6

x 4 3

6 1 2

x 3 2

2 4

+ 1 0

, 8 4

1 3 2

x 4 7

3 8 1

x 2 5

8 9 2

x 3 4

6 9 7

x 5 6

The Mrs. Bell’s fourth-grade class

at Orange Street Elementary sold more

bags of popcorn than any other class.

They ordered 17 cases of popcorn.

Each case had 242 bags. How many

bags of popcorn did the class sell?

The Theater in Daytona Beach can

seat 540 people at one time.

How many tickets can be sold if the

theater sells out every seat for one

30-day month?

It takes Mars 687 Earth days to revolve around the Sun. How many Earth days does it take Mars to revolve 24 times

around the Sun?

A nursery sells plants by the flat.

There are 6 plants in each tray. Each

flat has 6 trays. The nursery sold 16

flats on Saturday and 21 flats on

Sunday. How many plants did the

nursery sell in all?

The length of the Nile River in Africa

is about 14 times the length of Lake

Michigan. About how many miles long

is the Nile River?

LakeMichigan

300MilesLong

Multiply with zeros to see if your answer is reasonable.

An antique steam train makes one sight-seeing tour each day. If every seat is filled for

each trip, how many passengers can it carry for 31 tours?

The Train has a totalof 208 seats.

Multiply by zeros to estimate.

Then solve.

Suppose an average of only 103 seats

are filled for each train tour. What is

a reasonable estimate for the number

of passengers the train can carry in

28 tours?

Estimate – then solve

3 0 2

x 1 7

6 0 8

x 2 3

1 0 9

x 4 7

5 1 0

x 7 2

7 0 6

x 3 0

9 0 7

x 5 2

8 0 5

x 8 0

2 0 6

x 3 4

Estimate – then solve.

9 0 2

x 3 5

2 0 7

x 6 1

1 0 8

x 5 8

5 0 5

x 7 7

6 0 4

x 4 9

4 0 1

x 8 0

3 2 0

x 6 1

7 0 3

x 9 3

Jimmy orders 108 loaves of bread each day from the bakery for his dad’s Deli. He gets a variety of white, wheat, and rye. Each loaf

costs $2. How much does Jimmy spend daily for bread?

A flight departs at 8:45 a.m. It arrives 2 hours and 15 minutes later. What time

does the flight arrive?

There are 5 adult skeletons

on display in an exhibit

in a science museum.

How many bones are

there in all?

An adult has 206 bones.

There are more bones in a child’s

body because some of a child’s

bones fuse together as they grow. How many

more bones are in a child’s body than

in an adult’s body?

A child has300 bones.

Explorers from Spain first came to

Florida in 1513. After 308 years,

Spain gave up control of Florida to the

United States. In what year did this

change happen?

What figure has eight sides and

eight angles?

What would a net look like to build this

geometric solid?

Find each product.

1 2 1

x 2 1 2

2 4 3

x 1 3 5

3 3 2

x 1 2 7

2 0 8

x 3 2 4

3 7 2

x 1 5 3

4 1 4

x 1 2 6

3 0 9

x 2 1 3

4 2 5

x 2 3 1

Construction paper comes in packs of

275 sheets. How many sheets of

construction paper are in 2 gross?

Hint: 1 gross = 12 dozen or 144

Lauren was captain of 168 full flights

on the J-119 last fall. How many

passengers did she have on her

flights last fall?JETLINER SEATS

J-056 152

J-119 247

J-211 295

Fido’s dog food gives him 975 calories

of energy a day. How many calories

does he get from his food in 7 days?

Renting a boat at a marina costs $289

a day. In one month, the marina

rented boats 124 times. How much

money did they earn from the rentals?

Laura and Ryan both got new sun

glasses. Laura’s sunglasses cost

$275. Ryan’s sunglasses cost $80 less.

How much did they pay for their

sunglasses all together?

A class is building a model of their community. They have 12 complete sets of building blocks. How many

building blocks can the class use to build the model?

1,025 blocksper set

1,9 5 6

x 2 7

4, 1 5 2

x 8 3

3, 2 0 7

x 6 7

2, 3 8 4

x 7 2

3, 1 2 4

x 1 2

1, 6 2 7

x 4 1

1, 7 8 9

x 3 5

6, 1 5 3

x 2 4

Seminole leader

Osceola died in 1838.

A Florida county was

named in his

honor 49 years later.

In what year

did Osceola County get

its name?

There were 4,017 fans at the rodeo

championship. Each fan paid $5 for

admission. How much money was

collected in all?

On average, each American produces

1,657 pounds of trash in one year.

About how much trash does each

American produce in 10 years?

Maggie walks dogs and delivers papers

to earn money. This month, she earned

$54 delivering papers and $41 walking

dogs. She spent $12 on a new watch.

How much money does

Maggie have left this month?

A rectangular flag has a length of 209

feet and a width of 110 feet.

What is the perimeter? P = 2L + 2W

What is the area? A = L x W

In 2007, Florida’s

population was

estimated at

18,680,367. Which

digit is in the ten

millions place?

An electronic word-search puzzle game

is programmed with 1,225 word-search

puzzles. How many letters were

needed to create all of the puzzles for

the games?

Each puzzle uses 144letters.

Each puzzle has 15 hidden words.

If you complete 174 puzzles, how many

words will you have found?

Find each product by estimating the range.

89 x 174

80 x 100 = 8000

90 x 200 = 18000

RANGE

8000 to 18000

836 x 7,294 305 x 814 333 x 2,222

112 x 426 49 x 311 286 x 61 541 x 809

Estimates show that an average family

in America uses about 350 gallons of

water per day. At this rate, how much

water would a family use in 365 days?

The earth is always rotating even though

you cannot feel it. A point on the

equator travels about 1,038 miles every

hour. How far would the point travel

over 12 hours?

A recycling center recycles about 1,250

aluminum cans each day. At that rate,

how many cans would be recycled

in 31 days?

The official distance of a modern

marathon is 26 miles, plus 1,155 feet.

There are 5,280 feet in one mile.

How many feet are in a marathon?

Lake Okeechobee is Florida’s largest lake. A 110-mile trail loops around its shore. Melanie has biked 73 miles of the trail so far. How many miles does she have left in order to

complete the whole trail?

On average, it takes

about 2,500 pearls to

decorate a gown.

If a dress shop expects

to sell 200 beaded

gowns, about how

many pearls will be

needed?

Flight 719 carries 39 passengers. Each passenger brings 2 suitcases. The airplane

can safely carry 5,000 pounds of luggage. Is an exact answer needed or is an estimate

enough to decide if the luggage for this flight is under the weight limit?

Average weight36 pounds per

suitcase

There are 44 adults that want to take

a group tour of Mexico City. The cost

of each ticket is $12. Is an exact

answer needed or is an estimate

enough to find the total cost of the

tickets?

Norma bought two Tee-shirts for $14

each and a pair of shorts for $18.

She paid with a 50-dollar bill. How

much change did she get back?

At a craft fair, Sandra sold 13 bracelets,

24 pairs of earrings, and 7 necklaces.

How much did she make in all?

Earrings @ $18

Bracelets @$15

Necklaces @ $23

Andy wants to make at least $2000 at the craft fair. She sold 18 necklaces,

28 pairs of earrings, and 16 bracelets. Did she sell enough to meet her goal?

ANDY’S JEWELRY

EARRINGS $19

BRACELETS $17

NECKLACES $28

Carla’s highest score on a video game

is 398,540 points. Connor has a high

score of 407,735 points. What is the

difference between both scores?

Is an exact answer needed or is an

estimate good enough?

A sports store sold 536 baseball caps

during a clearance sale. The goal was

to sell at least 700 caps. How many

more caps did the store need to sell to

reach their goal?

A 10-pound bag of puppy food has

about 8,130 pieces of food. How many

pieces of food are in 25 bags of

puppy food?

The pet store sold 28 bags of kitty litter

during the first day of the sale. How

much money did the store earn on

these bags?

KITTY LITTERON SALE TODAY

Each 50 pound bag only $14

PUPPY FOODEach 10-pound bag on $19

Band members at one school

plan to practice 6 hours a week for

21 weeks to prepare for competition.

Which equation shows how

to find how much time the band

members will practice?

20 x 10 = 200

21 x 7 = 147

21 x 6 = 126

20 x 5 = 100

A one-month city bus pass costs $39.

Which of the following expressions

could you use to find the cost of the

bus pass in dollars for one year?

12 + 39 or 12 x 39 or 52 + 39 or 52 x 39

Britton Hill, Florida, is the location of the highest point in the state. It is 345 feet above

sea level. About how many sabal palms on top of each other would equal the height

of the highest point? TREE: SABAL PALM - AVERAGE HEIGHT IS 50 FEET

What is the difference between the greatest and least number of eggs that

a female largemouth bass may lay?

Life Span: up to 16 years

FLORIDA LARGEMOUTH BASS

NUMBER OF EGGS

BETWEEN 2,000 AND

145,000

If a female largemouth bass lays an

average of 4,000 eggs each year, how

many eggs might she lay in her

lifetime?

Life Span:

up to 16 years

Find the Product.

54 x 119 16 x 923 13 x 189 55 x 125

67 x 482 81 x 199 51 x 625 32 x 871

Find the Product.

34 x 108 76 x 504 47 x 302 83 x 206

55 x 604 94 x 708 68 x 409 21 x 807

Find the Product.

6 4 2

x 4 8 5

1 7 4

x 5 2 1

4 0 6

x 3 2 3

5 5 8

x 8 7 6

Find each product.

67 x 4,152 21 x 3,946 365 x 407 614 x 842

2,056 x 638 9,345 x 871 7,777 x 888 2,948 x 502

Remember that an estimate may be all you need to solve a problem when the words “about” and “almost” are used

in the question.

Tell whether an exact answer is needed or an estimate is enough.

Then solve.

Mrs. Hodges is making name tags for

the members of the Garden Club.

She must make tags for 18 girls and

13 boys. How many name tags must

she make?

On Tuesday, a snack bar sold 309 big

pretzels, 286 boxes of popcorn,

and 78 bags of peanuts. About how

many snacks did the snack bar sell?