What this lesson shows
532 − 178: trade 1 ten for 10 ones, then 1 hundred for 10 tens.
The worked example
The lesson works this one step by step: 532 − 178. Then your kid tries one like it on paper.
The steps
- Line up the ones
- Not enough? Trade 1 for 10
- Take away each place
- Check by adding back
Helping at home
Line up the ones and start from the right. When the top digit is not enough, cross out the digit on its left, write one less, and write 10 more above this place. Check by adding the answer to the number you took away.
If your kid gets stuck
Is the top digit enough?
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 3.NBT.A.2
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. - Common Core 4.NBT.B.4
Fluently add and subtract multi-digit whole numbers using the standard algorithm.
Matches a standard in all 50 states and DCSee each state's code
- Alabama MA19.3.11, MA19.4.10
- Alaska 3.NBT.2, 4.NBT.4
- Arizona 3.NBT.A.2 *, 4.NBT.B.4
- Arkansas 3.CAR.1, 4.CAR.2
- California 3.NBT.A.2, 4.NBT.B.4
- Colorado 3.NBT.A.2, 4.NBT.B.4
- Connecticut 3.NBT.A.2, 4.NBT.B.4
- Delaware 3.NBT.A.2, 4.NBT.B.4
- District of Columbia 3.NBT.A.2, 4.NBT.B.4
- Florida MA.3.NSO.2.1
- Georgia 3.PAR.2.1, 3.PAR.2.2, 4.NR.2.1
- Hawaii 3.NBT.A.2, 4.NBT.B.4
- Idaho 3.NBT.A.2, 4.NBT.B.4
- Illinois 3.NBT.A.2, 4.NBT.B.4
- Indiana 3.CA.2, 3.CA.1
- Iowa 3.NBT.A.2, 4.NBT.B.4
- Kansas 3.NBT.2, 4.NBT.4
- Kentucky KY.3.NBT.2, KY.4.NBT.4
- Louisiana 3.NBT.A.2, 4.NBT.B.4
- Maine 3.NBT.A.2, 4.NBT.B.4
- Maryland 3.NOS.D.7.a, 3.NOS.D.7.b, 3.NOS.D.7.c, 4.NOS.B.3.b, 4.NOS.B.3.c, 4.NOS.B.3.d
- Massachusetts 3.NBT.A.2, 4.NBT.B.4
- Michigan 3.NBT.A.2, 4.NBT.B.4
- Minnesota 3.1.2.1, 3.1.2.2
- Mississippi 3.NBT.2, 4.NBT.4
- Missouri 3.NBT.A.3, 4.NBT.A.5, 5.NBT.A.6
- Montana MT.3.NBT.2, MT.4.NBT.4, 4.D1.5, 4.D2.7
- Nebraska 3.A.1.a, 4.A.1.a
- Nevada 3.NBT.A.2, 4.NBT.B.4
- New Hampshire 3.NBT.A.2, 4.NBT.B.4
- New Jersey 3.NBT.A.2, 4.NBT.B.4
- New Mexico 3.NBT.A.2, 4.NBT.B.4
- New York NY-3.NBT.2, NY-4.NBT.4
- North Carolina NC.3.NBT.2.a, NC.3.NBT.2.b, NC.3.NBT.2.c, NC.4.NBT.4
- North Dakota 3.NO.NBT.3, 4.NO.NBT.4
- Ohio 3.NBT.2, 4.NBT.4
- Oklahoma 3.N.2.3
- Oregon 3.NBT.A.2, 4.NBT.B.4
- Pennsylvania CC.2.1.3.B.1, CC.2.1.4.B.2
- Rhode Island 3.NBT.A.2, 4.NBT.B.4
- South Carolina 3.PAFR.1.1, 4.PAFR.1.1, 3.PAFR.2.2
- South Dakota 3.NBT.A.2, 4.NBT.B.4
- Tennessee 3.NBT.A.2, 4.NBT.B.4
- Texas 111.5.b.4.A, 111.5.b.5.A, 111.6.b.4.A
- Utah 3.NBT.2, 4.NBT.4
- Vermont 3.NBT.A.2, 4.NBT.B.4
- Virginia 3.CE.1c, 3.CE.1e, 4.CE.1c, 4.CE.1d
- Washington 3.NBT.A.2, 4.NBT.B.4
- West Virginia M.3.13, M.4.9
- Wisconsin M.4.NBT.B.4, M.3.NBT.A.2
- Wyoming 3.NBT.2