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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
1 4 9
1 9 ×
9 × 9 =
81
9 × 40 =
360
9 × 100 =
900
10 × 9 =
90
10 × 40 =
400
10 × 100 =
+ 1000
2831