Lesson 1 Estimate and Find Products

- Let’s estimate and calculate products.

Warm-up Number Talk: A Multiple of 10

Find the value of each product mentally.

$50 \times 6$
$50 \times 60$
$50 \times 600$
$600 \times 500$

Activity 1 Reasonable Estimates

Which estimate for the product $18 \times 149$ is most reasonable? Explain or show your reasoning.
$2, 000$
$4, 000$
$3, 000$
$1, 500$
Are any of the estimates unreasonable? Explain or show your reasoning.
Do you think the actual product will be more or less than your estimate? Explain or show your reasoning.

Activity 2 Multiply by 18

Find the value of each expression. Explain or show your reasoning.

$18 \times 9$
$18 \times 49$
$18 \times 149$

Practice Problem

Problem 1

Find the value of each product. Explain or show your reasoning.

$100 \times 50$
$120 \times 50$
$127 \times 50$