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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
1 5 1
3 1 7 ×
7 × 1 = 7
7 × 50 = 3 5 0
7 × 100 = 7 0 0
10 × 1 = 1 0
10 × 50 = 5 0 0
10 × 100 = 1 0 0 0
300 × 1 =
300
300 × 50 =
15000
300 × 100 =
+ 30000
47867