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Tuesday, July 9, 2013

Maths portfolio Addition & Subtration

I am learning to solve addition and subtraction using level 3


1.  Maraea is saving to buy a cat.  In 3 weeks she has saved $9, $56 and $72.
Show how to work out how much she has saved altogether.
I am able to work out this problem using Level 3 Strategy:Place Value
$9,$56 and $72
$50 + $70 = $120
$6 + $2 = $8 + $9 = $17
$120 + $17 = $137


2.  Tom saves his money each month to buy a dog.  In 4 months he has saved $36, $78, $203, and $123.  Show how to work out how much he has saved altogether.
I am able to work out this problem using Level 3 Strategy: Place Value
$36 ,$78 ,$203 and $123
$200 + $100 = $300
$30 + $70 = $100 + $20 = $120
$3 + $3 = $6 + $6 = $12 + $8 = $20
$123 + $120 = $243
$243 + $300 = $543 + $20 = $563
Answer: 563

3.   Te Ao is saving to buy a horse.  So far she has saved $17, $160, $72, and $148.  Show how to work out how much she has saved altogether.

I am able to work out this problem using Level 3 Strategy: Place Value
$17,$160 ,$72 and $148
$100 + $100 = $200
$40 + $60 = $100
$10 + $70 = $80
$8 + $2 = $10 + $7 = $17
$200 + 100 = 300 + 80 = 380 + 17 = 397
Answer: 397


4.  Petelo has $ 147 as a present.  He spent $78 at the shop.  How much has he got left?
$147 - 78
$70 - $100 = $30
I only have $34 left
I minus 8 from $30 = $22 + $4 = $26


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