Starter quiz
- What is the word for the number above the fraction line?
- 'numerator' ✓
- Which of the following are equivalent to ?
- ✓
-
- ✓
- ✓
-
-
- Calculate + .
-
-
- ✓
-
-
- Calculate - .
-
-
- ✓
-
-
- The larger the denominator, the ______ the parts.
- 'smaller' ✓
- Sort the following from smallest to largest.
- 1⇔
- 2⇔
- 3⇔
- 4⇔
- 5⇔
Exit quiz
- The most efficient way to add or subtract fractions is using the ______.
- HCF
- LCM ✓
- same denominator
- doing the same to the top and bottom
-
- Which of the following is not a common denominator of and ?
- 2 ✓
- 12
- 36
- 120
-
- > ✓
- <
- =
-
- Calculate - .
-
- ✓
-
-
-
- Which of the following is not a correct alternative for - + ?
- + -
- - ✓
- + +
-
- Calculate - + ?
-
-
- ✓
-
-
Worksheet
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Presentation
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Lesson Details
Key learning points
- The denominators of each fraction should split the whole into the same number of equal pieces.
- The numerators are added or subtracted.
- The size of each piece has not changed so the denominator does not change.
Common misconception
Simply adding or subtracting the numerators and denominators.
Emphasise that the denominator tells us the name of the unit. In order to add or subtract things they must have a common name.
Keywords
Numerator - The expression in a fraction that is written above the fraction line. It is the dividend.
Denominator - The expression in a fraction that is written below the fraction line. It is the divisor.
Proper fraction - A proper fraction is a fraction where the numerator is less than the denominator.
Lcm - LCM is an abbreviation for lowest common multiple.
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