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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 7 1
1 1 8 ×
8 × 1 = 8
8 × 70 = 5 6 0
8 × 100 = 8 0 0
10 × 1 =
10
10 × 70 =
700
10 × 100 =
1000
100 × 1 =
100
100 × 70 =
7000
100 × 100 =
+ 10000
20178