What this lesson shows
A line from 0 to 100: place 50, then 25 and 75, then 79, 89, and 99 in order.
The worked example
The lesson works this one step by step: 79, 89, 99. Then your kid tries one like it on paper.
The steps
- Mark 50, then 25 and 75
- Find the tens around each number
- Left to right is least to greatest
Helping at home
Draw a line from 0 to 100 and mark 50 halfway, then 25 and 75. Find the tens each number sits between, and place it close to the nearer one. Left to right is least to greatest.
If your kid gets stuck
Which two tens is it between?
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 1.NBT.B.3
Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Matches standards in 50 statesSee each state's code
- Alabama MA19.1.12
- Alaska 1.CC.3, 1.CC.5, 1.NBT.1, 1.NBT.3
- Arizona 1.NBT.B.3
- Arkansas 1.NPV.7
- California 1.NBT.B.3
- Colorado 1.NBT.B.3
- Connecticut 1.NBT.B.3
- Delaware 1.NBT.B.3
- District of Columbia 1.NBT.B.3
- Florida MA.1.NSO.1.4
- Georgia 1.NR.1.3
- Hawaii 1.NBT.B.3
- Idaho 1.NBT.B.3
- Illinois 1.NBT.B.3
- Indiana 1.NS.4
- Iowa 1.NBT.B.3
- Kansas 1.NBT.3
- Kentucky KY.1.NBT.3
- Louisiana 1.NBT.B.3
- Maine 1.NBT.B.3
- Maryland 1.NOS.B.4, 1.NOS.B.5, 1.NOS.B.6
- Massachusetts 1.NBT.B.3
- Michigan 1.NBT.B.3
- Minnesota 1.1.1.5, 1.1.1.6
- Mississippi 1.NBT.3
- Missouri 1.NBT.A.3
- Montana MT.1.NBT.3
- Nebraska 1.N.3.b
- Nevada 1.NBT.B.3
- New Hampshire 1.NBT.B.3
- New Jersey 1.NBT.B.3
- New Mexico 1.NBT.B.3
- New York NY-1.NBT.3
- North Carolina NC.1.NBT.3
- North Dakota 1.NO.NBT.2
- Ohio 1.NBT.3
- Oklahoma 1.N.1.7, 1.N.1.8, 1.N.1.9, 2.N.1.2
- Oregon 1.NBT.B.3
- Pennsylvania CC.2.1.1.B.2
- Rhode Island 1.NBT.B.3
- South Carolina 1.NR.3.1
- South Dakota 1.NBT.B.3
- Tennessee 1.NBT.B.4, 1.NBT.A.2
- Texas 111.3.b.2.D, 111.3.b.2.E, 111.3.b.2.F, 111.3.b.2.G
- Utah 1.NBT.3
- Vermont 1.NBT.B.3
- Virginia 1.NS.2e, 1.NS.2f
- Washington 1.NBT.B.3
- West Virginia M.1.11
- Wisconsin M.1.NBT.B.3
More in this unit
- Counting on and back to 120
- The end of a row
- Skip counting by 2s and 5s
- Tens and ones
- Fifteen is not 51
- Expanded form counts tens
- Many ways to make a number
- Extra ones make a ten
- One more, ten more
- Ten more changes the tens
- Greater than, less than
- The tens decide first
- Growing patterns
- About, nearly, and benchmarks
- About how many?