Multiplying a 2-digit number by
625
- Select a 2-digit number.
- Add a zero and divide by 2.
- Divide by 8.
- Move the decimal point 3 places to the right.
Example:
- The 2-digit number chosen to multiply by 625 is 38.
- Add zero: 380; divide by 2: 380/2 = 190
- Divide by 8: 190/8 = 23 6/8 = 23.75
- Move the decimal point 3 places to the right: 23750
- So 625 x 38 = 23,750.
See the pattern?
- The 2-digit number chosen to multiply by 693 is 72.
- Add zero: 720; divide by 2: 720/2 = 360
- Divide by 8: 360/8 = 45
- Move the decimal point 3 places to the right: 45000
- So 625 x 72 = 45,000.
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