Decompose Once to Subtract

Examples, solutions, and videos to help Grade 3 students learn how to decompose once to subtract measurements including three-digit minuends with zeros in the tens and ones places.

Common Core Standards: 3.NBT.2, 3.NBT.1, 3.MD.1, 3.MD.2

New York State Common Core Math Grade 3, Module 2, Lesson 18

Worksheets for Grade 3

Homework

1. Solve the subtraction problems below.
   b. 370 L - 46 L
   j. 837 km - 645 km
2. A magazine weighs 280 grams less than a newspaper. The weight of the newspaper is shown below. How much does the magazine weigh? Use a tape diagram to model your thinking.
3. The chart to the right shows how long 3 games take.
   a. Francesca’s basketball game is 22 minutes shorter than Lucas’ baseball game. How long is Francesca’s basketball game? b. How much longer is Francesca’s basketball game than Joey’s football game?

Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

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