Problem
|
Strategy
|
Answer
|
37x9
|
30x9=270
7x9=63
270+63=333
|
333
|
47x15
|
40x10=400
40x5=200
7x10=70
7x5=35
400+200+70+35=705
|
705
|
65x7
|
60x7=420
5x7=35
420+35
|
455
|
81x9
|
80x9=720
1x9=9
|
729
|
72x17
|
70x10=700
70x7=490
2x10=20
2x7=14
700+490+20+14=1224
|
1224
|
39x12
|
30x12=360
9x12=108
360+108=468
|
468
|
187x9
|
100x9=900
80x9=720
7x9=63
900+720+63=
|
1683
|
77x33
|
70x30=2100
70x3=210
7x30=210
7x3=21
2100+210+210+21=
|
2541
|
Friday, 15 February 2019
Maths
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