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Tuesday, July 9, 2013

Ascott Portfolio 2013 Maths level 3 Addition and Subtraction

Show how you solve these number problems.  
I am able to solve addition and subtraction using place values and compatible numbers to solve a level 3 work sheet.

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.
$9 + $6 + $2= $17  $50 + $70= 120  $17 + 120= $137
I can see you were using the place value - how about compatible numbers
72 + 8 (from the 9) = 80
56 + 1 (left from 9) = 57
80 + 20 + 37 = 137
Can you try and do the other do this way and then post


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 take one out of the 8 and add it to the 6 which equals 7.
7 + 123 ( I took out the 7 out of the 37 ) = 130.
7 + 203 ( I took out the 7 out of the 77 remember I took 1 out of the 8 ) = 210
70 + 30 = 100                 
130 + 210 + 100 = 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.
$7 + $2 + $8= $17   $10 + $60 + $70 + $40= $180   $100 + $100= $200
$17 + $180 + $200= $397



4.  Petelo has $ 147 as a present.  He spent $78 at the shop.  How much has he got left?
$100 - $70= $30   $30 - $8= $22    
$22 + $7 + $40= $69




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