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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
1 4 0
1 7 ×
7 × 0 =
0
7 × 40 =
280
7 × 100 =
700
10 × 0 =
0
10 × 40 =
400
10 × 100 =
+ 1000
2380