Here are the solutions to the multiplication problems:
19. Find the product. 7×40=
Step 1: Multiply the non-zero digits.
7×4=28
Step 2: Add the zero from 40.
7×40=280
20. Find the product. 5,000×9=
Step 1: Multiply the non-zero digits.
5×9=45
Step 2: Add the three zeros from 5,000.
5,000×9=45,000
21. Find the product. 8×200=
Step 1: Multiply the non-zero digits.
8×2=16
Step 2: Add the two zeros from 200.
8×200=1,600
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