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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
9 4 2
7 7 2 ×
2 × 2 = 4
2 × 40 = 8 0
2 × 900 = 1 8 0 0
70 × 2 = 1 4 0
70 × 40 = 2 8 0 0
70 × 900 = 6 3 0 0 0
700 × 2 =
1400
700 × 40 =
28000
700 × 900 =
+ 630000
727224