Problem
|
Strategy
|
Answer
|
comments
|
1.37x9=
|
37x9= 30x9=270 7x9=63
270+63=
|
333
| |
2.47x 15=
|
40x15=600 7x15=105
|
705
| |
3.65x7=
|
30x7=210 30 x 7=210 5x7=35
210+210+35=
|
455
| |
4.81x9=
|
80x9=720 1x9=9
720+9=
|
729
| |
5.72x17=
|
72x7=504 72x10=720 504+720=
|
1224
| |
6.39x 12=
|
39x2=78 39x10=390 78+390
|
468
| |
7.187x9=
|
100x9=900 80x9=720 7x9=63 900+720+63=
|
1683
| |
8.77x 33=
|
77x30=2310 77x3= 210+21+2310=
|
2541
|
Friday, 15 February 2019
MATHS
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