Area with decimal sides: 5th grade math lesson

What this lesson shows

A square 0.7 inch on a side covers 49 hundredths of a square inch on a grid.

The worked example

The lesson works this one step by step: 0.7 × 0.7. Then your kid tries one like it on paper.

The steps

1 square inch, 100 small squares
Tenths across and down
Count the hundredths

Helping at home

Draw 1 square inch as a 10 by 10 grid; each small square is 1 hundredth of a square inch. Each side in tenths covers that many columns or rows. Count the small squares covered, and check with the fact: tenths times tenths make hundredths.

If your kid gets stuck

Columns and rows on a grid, then count hundredths.

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.

See how Lux works

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, 5.GM.2
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, MA.5.GR.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, 5.NF.B.4.d
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, 5.G.4.b
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, 5.GM.M.2
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, 111.7.b.4.H
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

Area with decimal sides