Addition and Subtraction

I am able to solve addition and subtraction problems in level 3 using three different strategies.

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.

$72 + $56 + $9 = ? ,

$70 + $60 = $130 + $10 = $140 - $5 = $135 + $2 = $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.

$36 + $78 + $203 + $123 = ?,

$40 + $80 = $120 + $200 = $320 + $120 = $440 + $6 = $446 - $3 = $443 - $3 = $440

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.

$17 + $160 + $72 + $148 = ?,

$20 + $160 = $180 + $70 = $250 + $150 = $400 - $3 = $397 + $2 = $399 - $2 = $397.  

4.  Petelo has $ 147 as a present.  He spent $78 at the shop.  How much has he got left?

$147 - $78 =?, $78 + ? = $147, $78 + $69 = $147.