Addition and Subtraction

I am able to work out addition and subtraction strategies in 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.

$72+$56+$9=?

$72+$8=$80.

$56+$1=57.

$80+$50=$130+7=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.

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

$200+$120=$320

$80+$40=$120

$120+$320=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.

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

70+20=90-5=85.

150+160= 310+85=395

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

147-78=?

150-80=70-5=65