Mathematics 5 curriculum guide 2015 I table of contents acknowledgements

Achievement Indicators:
5N2.3 Estimate a sum or 
product, using compatible 
numbers.
5N2.4 Apply front-end 
estimation to estimate:
• sums
• differences
• products
• quotients

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157
MATHEMATICS 5 CURRICULUM GUIDE 2015
Suggested Assessment Strategies
Resources/Notes
MULTIPLICATION
General Outcome: Develop Number Sense
Authorized Resource
Math Focus 5
Lesson 7: Estimating Products
TR: pp. 38–41
SB: pp. 198-200
Journal
• Ask students to respond to the following:
Judy’s class sold Belgian chocolate as a fund raiser for their school.
Her class sold 46 boxes of chocolate at $18.00 a box. Judy estimated
that her class raised $920.00. Explain her strategy and tell whether
you think her estimate is reasonable or not.
(5N2.7)
• Find two different ways to use compatible numbers to estimate each 
product and explain each method you used.
23 x 8 94 x 5 43 x 54
(5N2.4)
Interview
• Jane has to purchase hoodies for her team of 30 gymnasts. 
Each hoodie costs $63.00 and Jane estimates the total by using
$60.00 x 30 to get a cost of $1800.00. Ask students whether her 
estimate is too high or too low. In this case, why is a low estimate a 
problem? 
(5N2.8)
Paper and Pencil
Ask students to solve the following:
• You have four pieces of chocolate that each weigh 253 g. Estimate 
whether the total weight of these four pieces of chocolate is more or 
less than1 kg (1 000g). Explain your thinking.
(5N2.7)
• In each box, circle all factor pairs whose estimated product is in the 
center. Explain your choice for any two sets of factors.
2 × 599
6 × 212
3 × 395
4 × 304