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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 7 3
2 5 7 ×
7 × 3 = 2 1
7 × 70 = 4 9 0
7 × 200 = 1 4 0 0
50 × 3 = 1 5 0
50 × 70 = 3 5 0 0
50 × 200 = 1 0 0 0 0
200 × 3 =
600
200 × 70 =
14000
200 × 200 =
+ 40000
70161