Subtract mixed numbers
October 25, 2016
3.6 OBJECTIVES:
1. SUBTRACT MIXED NUMBERS WITH OR
WITHOUT RENAMING.
2. ESTIMATE DIFFERENCES BETWEEN MIXED
NUMBERS.
Subtract mixed numbers
October 25, 2016
Subtract mixed numbers without renaming.
Kim buys 2 3/4 yards of fabric. She cuts 1 1/8 yards to make a dress. How much fabric
does she have left?
To subtract, rewrite the fractional parts as like fractions first. Then subtract the
fractional parts before subtracting the whole numbers.
Subtract mixed numbers
5 5/9 - 2 1/3 =
October 25, 2016
Subtract mixed numbers
3 4/5 - 2 1/2 =
October 25, 2016
Subtract mixed numbers
October 25, 2016
Subtract mixed numbers with renaming.
A bottle contains 3 1/3 quarts of juice. Margaret uses 1 3/8 quarts of juice to make a
fruit punch. How much juice is left in the bottle?
Subtract mixed numbers
Find the difference between mixed numbers.
4 5/9 - 3 5/6 =
October 25, 2016
Subtract mixed numbers
Subtract. Express each difference in simplest form.
4 3/8 - 1 3/4 =
3 1/4 - 1 1/3 =
October 25, 2016
Subtract mixed numbers
4 1/6 - 3 5/8 =
4 1/2 - 1 7/8
October 25, 2016
Subtract mixed numbers
Complete WB pgs. 113-115.
October 25, 2016
Subtract mixed numbers
October 25, 2016
Use benchmarks to estimate differences between mixed numbers.
Estimate the difference between 4 7/8 and 3 5/12
Compare the fractional part in each mixed number to the benchmarks 0, 1/2, and 1.
_______________________________________________________________________
7/8 is about 1. So, 4 7/8 is about 5.
5/12 is about 1/2. So 3 5/12 is about 3 1/2.
Subtract mixed numbers
Estimate the difference between 5 1/8 and 2 7/9.
October 25, 2016
Subtract mixed numbers
October 25, 2016
Use benchmarks to estimate each difference.
7 7/9 - 3 4/7
23 2/5 - 17 1/6
`