Day 39 – Subtracting mixed number fractions Success Criteria I can find the lowest common denominator I can identify a mixed number fraction I can subtract mixed number fractions DNA Try to complete this times table grid in under 1 minute 30 seconds. Set a timer.
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Day 39 Subtracting mixed number fractions › wp...WARNING! Our answer is an improper fraction. We need to convert this improper fraction into a mixed number fraction. 31 8-8 = 5 40-40
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Day 39 – Subtracting mixed number fractions
Success Criteria
I can find the lowest common denominator
I can identify a mixed number fraction
I can subtract mixed number fractions
DNATry to complete this times table grid in under 1 minute 30 seconds. Set a timer.
Retrieval practice
What is the lowest common multiple of
15 and 1?
What is the product of 9 and 7?
What is the lowest common multiple of 3
and 2?
What is the product of 8 and 7?
How many degrees is there in a full circle?
What is the difference between 720cm and
1km?
1 HP
2 HPs
3 HPs
Retrieval practice answers
1 HP
2 HPs
3 HPs
What is the lowest common multiple of
15 and 1?15
What is the product of 9 and 7?
63
What is the lowest common multiple of 3
and 2?6
What is the product of 8 and 7?
56
How many degrees is there in a full circle?
360
What is the difference between 720cm and
1km?180cm
Explain what mistakes people could make doing this and how we could avoid them
Daily practice
0 to 12 times table for 16…
Daily practiceExample: People could not partition properly and add incorrectly
Write the definitions for the words we will come across today – can you think of an example question for the word?
Word Definition Example
Partition
Quotient
Whole number
Subtracting mixed number fractions
• Let’s dive straight into it!
Question One
• Let’s attempt this question together.
7
8- =
3
53 1
Step One – convert the first mixed number fraction into an improper fraction
7
8=3
My method(3 x 8) + 7
8= 31
8
Step Two – convert the second mixed number fraction into an improper fraction
3
5=1
My method(1 x 5) + 3
5= 8
5
Step Three – Make our denominator the same
We have to make our denominator (bottom numbers) the same. We need to get the lowest common multiple. Let’s write out the multiples of both 8 and 5.
• The multiples of 8 are: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80