What this lesson shows
Fixes a mistake
The total spent is not the answer when the story asks for the change.
The worked example
The lesson works this one step by step: $50 − $12.65 − $24.89. Then your kid tries one like it on paper.
The steps
- The total is not the answer
- One more step
- Add it back
Helping at home
Before you stop, read the question again: what does it ask for? When it asks for the change, take what you spent away from the bill, then add it back to check.
If your kid gets stuck
What does the question ask for?
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.B.7
Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
Matches a standard in all 50 states and DCSee each state's code
- Alabama MA19.5.8a, MA19.5.8b
- Alaska 5.NBT.7
- Arizona 5.NBT.B.7 *
- Arkansas 5.CAR.3, 5.CAR.4
- California 5.NBT.B.7
- Colorado 5.NBT.B.7
- Connecticut 5.NBT.B.7
- Delaware 5.NBT.B.7
- District of Columbia 5.NBT.B.7
- Florida MA.5.NSO.2.3, MA.5.NSO.2.4, MA.5.M.2.1
- Georgia 5.NR.4.4
- Hawaii 5.NBT.B.7
- Idaho 5.NBT.A.7.a, 5.NBT.A.7.b
- Illinois 5.NBT.B.7
- Indiana 5.CA.9, 5.CA.10
- Iowa 5.NBT.B.7
- Kansas 5.NBT.7
- Kentucky KY.5.NBT.7.a, KY.5.NBT.7.b
- Louisiana 5.NBT.B.7
- Maine 5.NBT.B.7
- Maryland 5.NOS.B.4.a, 5.NOS.B.5.a, 5.NOS.B.6.b, 5.NOS.B.6.c, 5.NOS.B.6.d, 5.NOS.B.7.a, 5.NOS.B.7.b, 5.NOS.B.7.c, 5.NOS.B.7.d, 5.NOS.B.7.e
- Massachusetts 5.NBT.B.7
- Michigan 5.NBT.B.7
- Minnesota 5.1.1.3, 5.1.3.1, 5.1.3.2, 5.1.3.4
- Mississippi 5.NBT.7
- Missouri 5.NBT.A.6, 5.NBT.A.7, 5.NBT.A.8, 5.NF.B.4, 5.RA.C.5
- Montana MT.5.NBT.7, 5.D1.11, 5.D1.12, 5.D1.13, 5.D2.11, 5.D2.12
- Nebraska 5.N.3.g, 5.A.1.c
- Nevada 5.NBT.B.7
- New Hampshire 5.NBT.B.7
- New Jersey 5.NBT.B.7
- New Mexico 5.NBT.B.7
- New York NY-5.NBT.7
- North Carolina NC.5.NBT.7.a, NC.5.NBT.7.b, NC.5.NBT.7.c, NC.5.NBT.7.d
- North Dakota 5.NO.NBT.5
- Ohio 5.NBT.7.a, 5.NBT.7.b, 5.NBT.7.c
- Oklahoma 5.N.2.1, 5.N.3.2, 5.N.3.3
- Oregon 5.NBT.B.7
- Pennsylvania CC.2.1.5.B.2
- Rhode Island 5.NBT.B.7
- South Carolina 5.PAFR.1.4, 5.PAFR.1.3
- South Dakota 5.NBT.B.7.a, 5.NBT.B.7.b
- Tennessee 5.NBT.B.7
- Texas 111.6.b.4.A, 111.7.b.3.A, 111.7.b.3.D, 111.7.b.3.E, 111.7.b.3.F, 111.7.b.3.G, 111.7.b.3.K
- Utah 5.NBT.7
- Vermont 5.NBT.B.7
- Virginia 4.CE.4a.i, 4.CE.4a.ii, 4.CE.4b, 5.CE.3a, 5.CE.3b.i, 5.CE.3b.ii, 5.CE.3b.iii, 5.CE.3c.i, 5.CE.3c.ii, 5.CE.3c.iii, 5.CE.3c.iv, 5.CE.3d, 5.CE.3e
- Washington 5.NBT.B.7
- West Virginia M.5.10
- Wisconsin M.5.NBT.A.4, M.5.NBT.B.7
- Wyoming 5.NBT.7