Let’s review Place Value · 9/1/2019  · Let’s review Place Value You need to have these place...

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IB Math Studies Yr 1 Name_________________________________ Date: ____________ Let’s review Place Value You need to have these place values memorized! You cannot round numbers properly unless you know the locations by their name. Steps to rounding numbers: “Circle-Check-Change” 1. Circle: circle the number in the place value you want to round to 2. Check: check the number to the right 3. Change: change the circled number o If the number to the right is 5 or more: o If the number to the right is less than five: **Every number to the right of the rounded number becomes zeros!** Examples: a. Round 4.768 to the nearest tenth b. Round 1, 745 to the nearest hundred. c. Round 459.87 to the nearest tens d. Round 8,256.7598 to the nearest thousandth Lesson 1-1: Place Value and Rounding Learning Goals: #1: How can we use our prior math knowledge of place value to help us round numbers?

Transcript of Let’s review Place Value · 9/1/2019  · Let’s review Place Value You need to have these place...

Page 1: Let’s review Place Value · 9/1/2019  · Let’s review Place Value You need to have these place values memorized! You cannot round numbers properly unless you know the locations

IB Math Studies Yr 1

Name_________________________________

Date: ____________

Let’s review Place Value

You need to have these place values memorized! You cannot round numbers properly unless you know the locations by their name.

Steps to rounding numbers: “Circle-Check-Change”

1. Circle: circle the number in the place value you want to round to 2. Check: check the number to the right 3. Change: change the circled number

o If the number to the right is 5 or more:

o If the number to the right is less than five:

**Every number to the right of the rounded number becomes zeros!**

Examples:

a. Round 4.768 to the nearest tenth b. Round 1, 745 to the nearest hundred.

c. Round 459.87 to the nearest tens d. Round 8,256.7598 to the nearest thousandth

Lesson 1-1: Place Value and Rounding

Learning Goals:

#1: How can we use our prior math knowledge of place value to help us round numbers?

Page 2: Let’s review Place Value · 9/1/2019  · Let’s review Place Value You need to have these place values memorized! You cannot round numbers properly unless you know the locations

IB Math Studies Yr 1

Practice!

1) Round the following to the nearest tenth.

a) 5.678 b) 12.41 c) 64.15783

2) Round the following to the nearest hundredth.

a) 5.672 b) 12.4177 c) 64.15783

3) Round the following to the nearest integer (whole number).

a) 5.672 b) 12.4177 c) 64.15783

4) Round each to the nearest tens place.

a) 16 b) 344 c) 31209.26

5) Round each to the nearest hundreds place.

a) 518 b) 7298 c) 40651.037

6) Round to the nearest thousands place.

a) 7298 b) 312999 c) 40651.037

Page 3: Let’s review Place Value · 9/1/2019  · Let’s review Place Value You need to have these place values memorized! You cannot round numbers properly unless you know the locations

IB Math Studies Yr 1

IB-Style Questions!

Model Problem: A problem has an exact answer of x = 862.354.

(a) State the value of x given correct to the nearest tenth

(b) State the value of x given correct to the nearest tens.

Practice: Given: 2656

0.572−0.447

(a) Calculate the value exactly.

(b) Write the answer to part (a) correct to the nearest 1000;

Page 4: Let’s review Place Value · 9/1/2019  · Let’s review Place Value You need to have these place values memorized! You cannot round numbers properly unless you know the locations

IB Math Studies Yr 1

Name_________________________________

Date: ____________

Lesson 1-1: Place Value and Rounding

1. Round each number below to the correct place value. a) nearest tenth

877.71 b) nearest integer

719.514

c) nearest hundred

81,502.161

d) nearest hundredth

0.50348 e) nearest thousandth

0.009201

f) nearest thousand

681,502.1615

2. A problem has an exact answer of 𝑥 = 11526.0829

a) State the value of x given correct to the nearest tens place.

b) Round the value of x correctly to the nearest hundredth.

3. Given: 7 + 2.5

3.7− 2.1

a) Calculate the value exactly.

b) Write the answer to part (a) correct to the nearest tenth.


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