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In this lesson, we will learn how to estimate products of up to 3-digit numbers by 2-digit numbers including decimals by rounding or using compatible numbers.
Q1:
We can estimate products by rounding each number to its greatest place value as in the example.
Use this method to estimate the following products.
Estimate 8 6 × 0 . 3 2 8 .
Estimate 7 1 7 × 0 . 9 0 1 .
Q2:
Estimate 7 7 1 2 × 8 2 9 .
Q3:
Which of the following is closest to 5 × 1 0 3 × 6 0 ? Solve without using a calculator.
Q4:
Use your rounding skills to estimate
Use the standard algorithm to find the exact answer.
Hint: Use your estimate to check your answer.
Q5:
Estimate 5 7 × 6 2 .
Q6:
Consider the product 8 7 2 × 0 . 0 8 2 .
Estimate the product by rounding each number to its greatest place value.
Calculate the product.
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