12+13-21=
14+64-43=
34+23-11=
44+56-28=
43×2=
23×4=
77×9=
456×2=
345×5=
35÷7=
69÷3=
Those who know abacus please answer ot in 2 min.
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Answer:
- 12+13-21 = 25-21 = 4
- 14+64-43 = 78 - 43 = 35
- 34+23-11 = 57 - 11 = 46
- 44+56 -28 = 100 - 28 = 72
- 43 × 2 = 86
- 23 × 4 = 92
- 77×9 = 693
- 456 × 2 = 912
- 345 × 5 = 1725
- 35 ÷ 7 = 5
- 69 ÷ 3 = 23
complete in 3 minute
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