Don't subtract, Add

1. 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✔

2. 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 ✔

                              

3. 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

                          7+36=93 so 93-57=36  ✔

4. 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✔

5. Sam has $110 and spends $89 on some play station 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✔

6. 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 ✔

7. I wanted to collect $100 for charity, but only managed to get $82. How much less than $100 is that?

  82+8=90

                     90+10=100

                       18✔

                            

The hard bit of this maths was I  couldn't  work out the answers in my head using multiplication.