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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 3 7
1 4 ×
4 × 7 = 2 8
4 × 30 = 1 2 0
4 × 100 = 4 0 0
10 × 7 =
70
10 × 30 =
300
10 × 100 =
1000
1918