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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 8 7
1 9 ×
9 × 7 = 6 3
9 × 80 = 7 2 0
9 × 100 = 9 0 0
10 × 7 =
70
10 × 80 =
800
10 × 100 =
1000
3553