What this lesson shows
Fixes a mistake
7.8 × 0.1 is 0.78, not 78. Times a tenth makes it smaller.
The worked example
The lesson works this one step by step: 7.8 × 0.1. Then your kid tries one like it on paper.
The steps
- Bigger or smaller?
- Times 0.1: one place right
- Times 10: one place left
Helping at home
Before moving any digit, ask whether the answer should be bigger or smaller. Times 0.1 is less than 1, so the answer is smaller: each digit moves one place right. Times 10 moves each digit one place left.
If your kid gets stuck
Bigger or smaller? Then move the digits that way.
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.
Standards
- Common Core 5.NBT.A.2
Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.
Matches a standard in all 50 states and DCSee each state's code
- Alabama MA19.5.3a, MA19.5.3b
- Alaska 5.NBT.2
- Arizona 5.NBT.A.1 *, 5.NBT.A.2
- Arkansas 5.NPV.2, 5.CAR.12
- California 5.NBT.A.2
- Colorado 5.NBT.A.2
- Connecticut 5.NBT.A.2
- Delaware 5.NBT.A.2
- District of Columbia 5.NBT.A.2
- Florida MA.5.NSO.1.1, MA.5.NSO.2.5
- Georgia 5.NR.1.2
- Hawaii 5.NBT.A.2
- Idaho 5.NBT.A.2
- Illinois 5.NBT.A.2
- Indiana 5.NS.3
- Iowa 5.NBT.A.2
- Kansas 5.NBT.2
- Kentucky KY.5.NBT.2
- Louisiana 5.NBT.A.2
- Maine 5.NBT.A.2
- Maryland 5.NOS.A.2
- Massachusetts 5.NBT.A.2
- Michigan 5.NBT.A.2
- Minnesota 4.1.1.2
- Mississippi 5.NBT.1, 5.NBT.2
- Missouri 5.NBT.A.3, 5.NBT.A.4
- Montana MT.5.NBT.2, 5.D3.1, 5.D4.3, 5.D4.4
- Nebraska 5.N.1.b, 5.N.1.c
- Nevada 5.NBT.A.2
- New Hampshire 5.NBT.A.2
- New Jersey 5.NBT.A.2
- New Mexico 5.NBT.A.2
- New York NY-5.NBT.2
- North Carolina NC.5.NBT.1.b
- North Dakota 5.NO.NBT.7
- Ohio 5.NBT.2
- Oklahoma 4.N.1.3
- Oregon 5.NBT.A.2
- Pennsylvania CC.2.1.5.B.1
- Rhode Island 5.NBT.A.2
- South Carolina 5.NR.1.2, 5.NR.1.4
- South Dakota 5.NBT.A.2
- Tennessee 5.NBT.A.2
- Texas 111.6.b.4.B
- Utah 5.NBT.2
- Vermont 5.NBT.A.2
- Virginia 4.NS.4a, 4.NS.4d, 5.CE.3c.iii
- Washington 5.NBT.A.2
- West Virginia M.5.5
- Wisconsin M.5.NBT.A.2
- Wyoming 5.NBT.2