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2 cijfers X 2 cijfers met hulp [1]

2 cijfers X 2 cijfers met hulp [1]

 
4 3
4 7 ×
7 × 3 = 2 1
7 × 40 = 2 8 0
40 × 3 =
120
40 × 40 =
+ 1600
2021