Achievement Objectives
NA5-3: Understand operations on fractions, decimals, percentages, and integers.
NA5-6: Know and apply standard form, significant figures, rounding, and decimal place value.
Specific Learning Outcomes
Solve multiplication and division problems that involve fractions.
Use rounding to check the answers to multiplication and division problems.
Description of Mathematics
Number Framework Stage 8
Required Resource Materials
Estimating x/➗ Decimals (Material Master 8-17)
Activity
Using Number Properties
Problem: “Estimate 0.503 x 58.7.”
Discuss why ½ x 60 = 30 is sensible.
Problem: “Martha gets 34.56 ÷ 0.98 = 33.8688 on her calculator. Is she correct?”
(Answer: Martha must be wrong as division by a number less than 1 makes the answer bigger.)
Problem: “Estimate 59.89 x 0.091.” (Possible answer: 59.89 x 0.091 ≈ 60 x 0.1, and 1 tenth of 60 = 6.)
Examples: Worksheet (Material Master 8–17).
Add to plan
Level Five