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Multiplying: 3 digits times 2 digits with hints [1]

Multiplying: 3 digits times 2 digits with hints [1]

 
 
454
21 ×
1 × 4 = 4
1 × 50 = 50
1 × 400 = 400
20 × 4 =
80
20 × 50 =
1000
20 × 400 =
+ 8000
9534