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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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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