Ordering Fractions
Which fraction is smaller: ½ or ¼ ?
¼
1 – ½ = ?
½
1/5 + 2/5 ?
3/5
What does the commutative property of addition mean?
Order can change, sum stays same (e.g. 3 + 5 = 5 + 3).
34 + 25 = ?
59
Arrange ½, ⅓, ¼ from smallest to largest.
¼, ⅓, ½
1 – ¼ = ?
¾
7/8 + 6/8 ?
13/8
What is the associative property?
Grouping changes but sum stays same (e.g. (2 + 3) + 4 = 2 + (3 + 4)).
Estimate 48 + 53 by rounding to nearest tens.
50 + 50 = 100
Which is greater: ⅗ or ⅔ ?
⅗
2 – ½ = ?
1½
4 + 1/5 ?
4 1/5 or 21/5
Does subtraction have the commutative property?
No
72 – 19 = ?
53
What fraction equals 0.5 ?
½
3 – ⅔ = ?
2⅓
2/3 + 4/5 ?
22/15 or 1 7/15
Which property is shown by 6 + 0 = 6 ?
Identity Property
Estimate 63 – 29 by rounding to nearest ten.
60 – 30 = 30
Order ⅖, ⅗, ⅘ from least to greatest.
⅖, ⅗, ⅘
4 – 2½ = ?
1½
3/3 + 5/7 ?
12/7
Which properties help you add mentally with ease?
Commutative and Associative Properties
How does estimation help you check your answers?
It shows if your exact answer is reasonable or close to expected.