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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
5 4 2
4 9 ×
9 × 2 =
18
9 × 40 =
360
9 × 500 =
4500
40 × 2 =
80
40 × 40 =
1600
40 × 500 =
+ 20000
26558