How to multiply a number by 10, 100, and 1000 (4th grade math)
I show the easy shortcut for multiplying any number by 10, 100, or 1000. I also explain WHY IT WORKS... using a place value chart.
After that we solve a short word problem. Then we use this shortcut in DIVISION and divide numbers by 10, 100, or 1000. Lastly we solve another short word problem about age and years.
You can do online practice problems about this concept at this link.
See also
Multiply with zeros — online practice for multiplying numbers with zeros, such as 20 × 300 or 7,000 × 200.
Remainder in division-related word problems — video lesson
Math Mammoth Grade 4 curriculum