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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
3 4 0
2 4 7 ×
7 × 0 = 0
7 × 40 = 2 8 0
7 × 300 = 2 1 0 0
40 × 0 =
0
40 × 40 =
1600
40 × 300 =
12000
200 × 0 =
0
200 × 40 =
8000
200 × 300 =
+ 60000
83980