Large Numbers Roll Over I am learning how a number rolls over when 10 of any unit occur in addition,...
4
Large Numbers Roll Over I am learning how a number rolls over when 10 of any unit occur in addition, and how the number rolls back when 10 of any unit occur in a subtraction $1 $10 $100 = 10 X 10 X = 10 X $100 = $1,000 10 X $1,000 = $10,000 $10,000 10 X = $100,00 0 $10
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Transcript of Large Numbers Roll Over I am learning how a number rolls over when 10 of any unit occur in addition,...
Large Numbers Roll Over
I am learning how a number rolls over when 10 of any unit occur in addition, and how the number rolls back when 10 of any unit occur in a subtraction
$1
$10 $100
=10 X
10 X =
10 X $100 = $1,000
10 X $1,000 = $10,000
$10,00010 X = $100,000
$10
Kane’s Lawn Mowing earned $9,997. On their last job of the week they earned another $18. How much money did they earn in total? 9,997 + 18 = ?
Step 1: Let’s use coins and notes to record how much Kane’s Mowing earned ($9,997).
$1$10$100$1,000
$1,000$1,000
$1,000
$1,000
$1,000$1,000
$1,000
$1,000
$100
$100
$100$100$100$100
$100
$100
$10
$10$10
$10
$10$10$10$10
$1
$1
$1
$1
$1
$1
Step 2: Now record the extra $18 he earned.
$1
$1
$1
$1
$1
$1
$1
$1
$10
Exchange ten of the $1 coins for a $10 note.
$10Exchange ten of the $10 notes for a $100 note.
$10
$100
Exchange ten of the $100 notes for a $1,000 note.
$1,000
Exchange ten of the $1,000 notes for a $10,000 note.
$10,000
Add together what’s left.
10,000 + 10 + 5 = 10,015
Angela had $4, 403. She spent $8. How much money did she have left? 4,403 - 8 = ?
Step 1: Let’s use coins and notes to record how much money Angela had ($4,403).
$1,000
$1,000
$1,000
$1,000
$100$100
$100
$100
$1
$1
$1
Step 2: We can’t take away $8 as there are only $3 so we must break one of the $100 notes into ten $10 notes.
$10
$10
$10$10
$10
$10$10$10$10
$10
$10$100
$100
$100
Step 3: Now we need to split one of the $10 notes into ten $1 coins.
$10
$10
$10$10
$10
$10$10$10$10
$10
$1
$1
$1
$1
$1
$1
$1
$1
$1
$1
Step 4: Now we can subtract the $8.
Step 5: The amount left is the answer.
4, 000 + 300 + 90 + 5 = 4,395
Now try these questions on your own. Try to imagine the amounts in your head. If you get stuck you may need to use some play money to help you.
Need some more practise? Try Pg58 of Teacher Tools Addition and Subtraction Book Numeracy resources
1) 13,899 + 3 = ?
2) 4, 200 – 4 = ?
3) 45,999 + 11 = ?
4) 82, 010 – 11 = ?
5) 99,999 + 4 = ?
Click again when you have completed each question and the answer will be displayed.
13,902
4,196
46,010
81,999
100,003
