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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
2 9 4
1 8 5 ×
5 × 4 =
20
5 × 90 =
450
5 × 200 =
1000
80 × 4 =
320
80 × 90 =
7200
80 × 200 =
16000
100 × 4 =
400
100 × 90 =
9000
100 × 200 =
+ 20000
54390