The document describes how to estimate the product of a whole number and a decimal by rounding each number to the greatest place value with a non-zero digit. It provides two examples, showing how to round 52 to 50 when multiplying by 8.9, and how to round 825 to 800 when multiplying by 0.46. The rounded numbers are then multiplied to estimate the products as 450 for 52 x 8.9 and 4000 for 825 x 0.46.

1. 6-3 Estimating the
Product of a Whole
Number and a Decimal
Math Notes
Number Sense 2.1

2. Estimate 52 x 8.9
52 x 8.9

3. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9

4. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
Remember, do not round any single digit factors.

5. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
Remember, do not round any single digit factors.

6. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
Remember, do not round any single digit factors.

7. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
50
Remember, do not round any single digit factors.

8. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
50
Remember, do not round any single digit factors.

9. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
50
Remember, do not round any single digit factors.

10. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
50 x 9 =
Remember, do not round any single digit factors.

11. Estimate 52 x 8.9
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
52 x 8.9
50 x 9 = 450
Remember, do not round any single digit factors.

12. Estimate 825 x 0.46
825 x 0.46

13. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46

14. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
Remember, do not round any single digit factors.

15. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
Remember, do not round any single digit factors.

16. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
Remember, do not round any single digit factors.

17. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
Remember, do not round any single digit factors.

18. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800
Remember, do not round any single digit factors.

19. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800
Remember, do not round any single digit factors.

20. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800
Remember, do not round any single digit factors.

21. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800
Remember, do not round any single digit factors.

22. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800 x 0.5 =
Remember, do not round any single digit factors.

23. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800 x 0.5 = 4000
Remember, do not round any single digit factors.

24. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800 x 0.5 = 4000
Remember, do not round any single digit factors.

25. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800 x 0.5 = 4000
Remember, do not round any single digit factors.

26. Estimate 825 x 0.46
STEP ONE: Estimate by rounding each number to the
greatest place that has a NONZERO digit.
825 x 0.46
800 x 0.5 = 4000
.
Remember, do not round any single digit factors.