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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 4 9
1 8 9 ×
9 × 9 = 8 1
9 × 40 = 3 6 0
9 × 100 = 9 0 0
80 × 9 =
720
80 × 40 =
3200
80 × 100 =
8000
100 × 9 =
900
100 × 40 =
4000
100 × 100 =
+ 10000
28161