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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
3 8 1
9 7 4 ×
4 × 1 = 4
4 × 80 = 3 2 0
4 × 300 = 1 2 0 0
70 × 1 = 7 0
70 × 80 = 5 6 0 0
70 × 300 = 2 1 0 0 0
900 × 1 =
900
900 × 80 =
72000
900 × 300 =
+ 270000
371094