K-5 friendly lesson

One small step at a time.Read the idea, try the activity, and celebrate each win as you go.

Mixed Sentences to 20: Which is True?

⚡️ A fast-paced true or false challenge with both pluses and minuses! Keep your eyes peeled for the math signs.

Do this: Read the concept below, then try the quiz or activity.

Lesson 77 of 180

Concept

You know how to check addition, and you know how to check subtraction. Now they are completely mixed up!

🎯 The "Double Check" Rule: 1. Check the sign: Is it a plus or a minus? 2. Check the math: Do the calculation. 3. Check the balance: Does it match the number on the other side of the equals sign?

Sometimes, both sides of the equals sign will have math on them! Example: 5 + 4 = 10 - 1 1. Solve the left side: 5 + 4 = 9. 2. Solve the right side: 10 - 1 = 9. 3. Does 9 = 9? YES! This is a TRUE sentence!

Try it

Double check your math!

Instructions: Check the sign (+ or -), solve the math, and decide if the seesaw is balanced.

1. 14 + 5 = 19
   * True / False

2. 16 - 7 = 10
   * True / False

3. 8 + 6 = 15
   * True / False

4. 20 - 8 = 12
   * True / False

Hardcore Challenge: Balance both sides!
5. 6 + 6 = 15 - 3
   * Left side: ___. Right side: ___.
   * True / False?

6. 10 + 2 = 20 - 7
   * True / False?

Complete & Continue →