Guess and Check Lesson Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone
The Guess and Check strategy requires students to guess a solution, test its correctness, and refine the guess using logical reasoning.

If you don't know how to solve a problem, make an educated guess at the answer. Check your guess. If you're wrong, use what you've learned in checking your guess to make a better guess. Continue to guess, check, and modify until you find the answer.

Example

 Read Students in Mrs. Carroll's sixth-grade class ordered school shorts. The denim shorts cost \$15 and the flannel shorts cost\$9. If Mrs. Carroll's students ordered 28 shorts and spend a total of \$300, how many denim shorts did they order? Plan One way to solve the problem is to make a guess, test it, and revise your guess until you find the correct answer. Solve Guess: 10 for \$15, and 18 for \$9 Test: 10 x \$15 = \$150 and 18 x \$9 = \$162 \$150 + \$162 = \$312 Revise: Too high. Try fewer \$15 shorts. Guess: 9 for \$15, and 19 for \$9 Test: 9 x \$15 = \$135 and 19 x \$9 = \$171 \$135 + \$171 = 406 Revise: Too high. Try fewer \$15 shorts. Guess: 8 for \$15, and 20 for \$9 Test: 8 x \$15 = \$120 and 20 x \$9 = \$180 \$120 + \$180 = \$300 The students ordered 8 denim shorts.

 Remember: How can you use each guess to help you decide on a better next guess? If the amount is too high, try fewer. If too low, try more.

Let's Practice!