Unit 3, Lesson 12

Subtract Strategically

Grade 3

Warm-up

Number Talk: Threes

Find the value of each expression mentally.

Activity 1

How Would You Subtract?

Use a strategy or an algorithm of your choice to find the value of each difference. Show your reasoning. Organize your work so it can be followed by others.

Activity 2

Greatest Difference, Least Difference

Decide with your partner whether you will try to make the greatest difference or the least difference
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
Compare your values.
Write a comparison, using >, <, or =.
Play again.

<span>Spinner. 10 equal parts. Labeled 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.</span>

Recording Sheet for Greatest Difference, Smallest Difference.

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