- Moana has $81 and she gives her friend $18. How much money does Moana have left?
18 + 2 = 20
20 + 60 = 80
80 + 1 = 81
18 + 63 = 81 so 81 - 18 = 63✔
- Jake collected $75 from his pocket money to buy a present for his mum. The present only costs $39 so how much change does he have?
39 + 1 = 40
40 + 30 = 70
70 + 5 = 75
39 + 36 = 75 so 75 - 39 = 36✔
- Dad takes $93 with him to the fair. He comes back with $57. How much did he spend?
57 + 3 = 60
60 + 30 = 90
90 + 3 = 93
57 + 36 = 93 so 93 - 57 = 36✔
- At the park the lolly seller has collected in $103
She has to pay $88 out for buying lollies for the next day. How much money does she have left?
88 + 2 = 90
90 + 10 = 100
100 + 3 = 103
88 + 15 = 103 so 103 - 88 = 15✔
- Sam has $110 and spends $89 on some playstation games he wanted. How much money does he have left? 89 + 1 = 90
90 + 10 = 100
100 + 10 = 110
89 + 21 = 110 so 110 - 89 = 21✔
- I start shopping with $64 and come home with $38. How much did I spend when I was out shopping?
38 + 2 = 40
40 + 20 = 60
60 + 4 = 64
38 + 26 = 64 so 64 - 38 = 26✔
- I wanted to collect $100 for charity, but only managed to get $82. How much less than $100
82 + 8 = 90
90 + 10 = 100
18✔
The hard thing for me was thinking in your head fast without using calculator
Using Multiplication.
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