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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
3 1 9
7 4 ×
4 × 9 =
36
4 × 10 =
40
4 × 300 =
1200
70 × 9 =
630
70 × 10 =
700
70 × 300 =
+ 21000
23606