Mathematics 5 curriculum guide 2015 I table of contents acknowledgements

5N11 Continued...
Achievement Indicators:
5N11.3 Explain why keeping 
track of place value positions is 
important when adding and 
subtracting decimals.
= 1 whole
= 
1
10
= 
1
100
= 1 whole
=
1
10
= 
1
100
= 
1
1 000
4 5 . 7 6 3 
3 . 4 2
4 9 . 1 8 3 
+ 

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65
MATHEMATICS 5 CURRICULUM GUIDE 2015
Suggested Assessment Strategies
Resources/Notes
ADDING AND SUBTRACTING DECIMALS
General Outcome: Develop Number Sense
Authorized Resource
Paper and Pencil
• 
Maria’s math book has a mass of 0.573 kg, her social studies book is 
0.45 kg, and her science book is 0.108 kg. Ask students to determine 
the total mass of Maria’s books.
(5N11.4)
Performance
• 
Ask students to use base ten materials to model and solve the 
following: 
(i) 3.2 + 4.51 
(ii) 3.21 - 1.41 
(iii) 3.234 + 1.123 
(iv) 1.562 - 1.238
(5N11.4)
Interview
• 
Present students with a solution containing an error such as:
Scott wrote 5.23 + 4.232 = 4.755
Ask students to identify the error that occurred and explain to Scott
how he could correct the error.
(5N11.3)
Journal
• 
Ask students to respond to the following prompt: 
When adding 24.56 and 1.735, Ariana got a total of 4.191.
How can you tell if her answer is reasonable? If it is not, what was 
her error?
(5N11.3)
Math Focus 5
Lesson 5: Adding Decimals by 
Regrouping
TR: pp. 30-34
SB: pp. 94-97
Suggested Resource
• Resource Link: https://www.
k12pl.nl.ca/curr/k-6/math/
grade-5/links/unit2
-online base 10 blocks

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