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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
8 5 3
4 5 7 ×
7 × 3 = 2 1
7 × 50 = 3 5 0
7 × 800 = 5 6 0 0
50 × 3 =
150
50 × 50 =
2500
50 × 800 =
40000
400 × 3 =
1200
400 × 50 =
20000
400 × 800 =
+ 320000
389821