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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
8 7 1
4 1 8 ×
8 × 1 = 8
8 × 70 = 5 6 0
8 × 800 = 6 4 0 0
10 × 1 =
10
10 × 70 =
700
10 × 800 =
8000
400 × 1 =
400
400 × 70 =
28000
400 × 800 =
+ 320000
364078