Benchmark and Common Denominators
What is a common denominator for 3/7 and 2/3?
Answers Will Vary
Sandy sanded a dress for 1 1/4 hours. Then she stained it for 2 1/3 hour. How much time did she sand the dresser for?
1 3/12 or 1 1/4
5 3/4 - 2 1/4
3 1/2
Find the missing number:
1/8, 3/8, _____, 7/8, 9/8
5/8
1 2/3 + 3 1/3 + 4/5
5 4/5
What is a common denominator for 1/5, 1/6 and 1/10?
AWV
Sandy sanded a dress for 1 1/4 hours. Then she stained it for 2 1/3 hour. How much more time did she stain the dress then sand?
1 1/12
6 1/3 - 2 2/3
3 2/3
Find the missing number:
13 3/10, 13 4/5, 12 3/10, ______, 11 3/10
12 4/5
1/8 + 5/6 + 1/6
1 1/8
What benchmark would you round 3 1/8 to?
3
What is the difference of 5 1/3 and 4 1/2?
5/6
7 1/4 - 3 3/4
3 1/2
State the pattern:
3/10, 2/5, 5/10, 3/5, 7/10
add 1/10
True or false
1 2/3 + 3 1/3+ 4/5 = 3 1/3+ 1 2/3 + 4/5
True
What benchmark would you round 1 2/5 to?
1 1/2
Kyle swam for 4 2/3 lengths of the pool. Mis swam 6 1/2 lengths of the pool. How many more lengths of the pool did Mia swim than Kyle?
1 5/6
5 - 2 7/8
2 1/8
5 3/4, 5 1/8, 4 1/2, 3 7/8
Subtract 5/8
True or false:
1/8 + 5/6 + 1/6 = 1/8 + 5/6 + 1/6
True
If you added 3 1/8 and 1 2/5, what benchmark would you round the sum to?
4 1/2
3 1/8
12 1/6 - 7 5/6
4 1/3
3/8, 9/16, 3/4, 15/16
add 3/16
True or false
5/7 + 2/9 + 4/7 = 5/7 - (4/7 + 2/9)
False