What this lesson shows
38 + 45 makes 7 tens and 13 ones. 10 ones make a new ten, so 83.
The worked example
The lesson works this one step by step: 38 + 45 = □. Then your kid tries one like it on paper.
The steps
- Add the tens
- Add the ones
- Ten ones make a new ten
Helping at home
Show each number as tens and ones. Add the tens, then add the ones. When there are 10 ones or more, trade 10 of them for a new ten.
If your kid gets stuck
Add the tens first, then the ones.
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 2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Matches a standard in all 50 states and DCSee each state's code
- Alabama MA19.2.10
- Alaska 2.NBT.5
- Arizona 2.NBT.B.5
- Arkansas 2.CAR.2
- California 2.NBT.B.5
- Colorado 2.NBT.B.5
- Connecticut 2.NBT.B.5
- Delaware 2.NBT.B.5
- District of Columbia 2.NBT.B.5
- Florida MA.2.NSO.2.3
- Georgia 2.NR.2.3, 2.NR.2.4
- Hawaii 2.NBT.B.5
- Idaho 2.NBT.B.5
- Illinois 2.NBT.B.5
- Indiana 2.CA.3
- Iowa 2.NBT.B.5
- Kansas 2.NBT.5
- Kentucky KY.2.NBT.5
- Louisiana 2.NBT.B.5
- Maine 2.NBT.B.5
- Maryland 2.NOS.B.6.c, 2.NOS.C.8.a, 2.NOS.C.8.b
- Massachusetts 2.NBT.B.5
- Michigan 2.NBT.B.5
- Minnesota 2.1.2.3, 2.1.2.4
- Mississippi 2.NBT.5
- Missouri 2.NBT.B.6, 2.NBT.B.9
- Montana MT.1.NBT.6, MT.2.NBT.5
- Nebraska 1.N.4.g, 2.N.4.b
- Nevada 2.NBT.B.5
- New Hampshire 2.NBT.B.5
- New Jersey 2.NBT.B.5
- New Mexico 2.NBT.B.5
- New York NY-2.NBT.5
- North Carolina NC.2.NBT.5.a, NC.2.NBT.5.c
- North Dakota 2.NO.NBT.3, 2.NO.NBT.4, 2.AR.OA.2
- Ohio 2.NBT.5
- Oklahoma 2.N.2.4
- Oregon 2.NBT.B.5
- Pennsylvania CC.2.1.2.B.3
- Rhode Island 2.NBT.B.5
- South Carolina 2.PAFR.1.4, 2.PAFR.1.1
- South Dakota 2.NBT.B.5
- Tennessee 1.NBT.C.7, 2.NBT.B.5, 2.OA.B.2
- Texas 111.4.b.4.B
- Utah 2.NBT.5
- Vermont 2.NBT.B.5
- Virginia 2.CE.1a, 2.CE.1b
- Washington 2.NBT.B.5
- West Virginia M.2.10
- Wisconsin M.2.NBT.B.5
- Wyoming 2.NBT.5