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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
7 2 2
9 4 1 ×
1 × 2 = 2
1 × 20 = 2 0
1 × 700 = 7 0 0
40 × 2 = 8 0
40 × 20 = 8 0 0
40 × 700 = 2 8 0 0 0
900 × 2 =
1800
900 × 20 =
18000
900 × 700 =
+ 630000
679402