Unit 9: Measurement, Units, and Estimation

Day 29 of 30

Review estimation strategies

K-2Mathematics

Content is AI-assisted and continuously improved through educator review

Learning Objective

I can review and apply knowledge of estimation strategies.

Today's Lesson

Today we will learn how to review estimation strategies. Math helps us solve problems and understand the world around us.

Estimation means finding an answer that's close to the exact answer, using easier numbers. To estimate, you can round numbers first, then calculate. For example, to estimate 48 + 27, round to 50 + 30 = 80 (actual: 75). Estimation is useful for checking if your answer makes sense, making quick decisions, and mental math. A good estimate is close to the real answer but faster to find!

Let's break this down step by step so it's easy to understand. Follow along with the examples, and don't worry if it takes some practice to get the hang of it!

Remember: Making mistakes is part of learning. If something is tricky, try again, look at the examples, or ask for help.

Key Terms
Problem

A question we need to solve

Solution

The answer to a problem

Activities
Instructions
1. Use objects or pictures to explore review estimation strategies. 2. Try the examples together. 3. Solve practice problems. 4. Check your work.
Materials Needed
  • Counters or objects
  • Pencil
  • Practice sheet
Practice Problems
1

Estimate: 48 + 33

Hint: Round each to nearest 10 first: 50 + 30
2

Estimate: 89 - 42

Hint: Round: 90 - 40
3

Estimate the product: 19 × 21

Hint: Round to 20 × 20

Teaching Tip

For younger learners: Use concrete objects and hands-on activities when teaching review estimation strategies. Keep sessions short (10-15 minutes) and incorporate movement or songs when possible.

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