Transcript 7-1: Estimating Products

7-1: Estimating Products
How do I do it?
Ex. 1: Round the whole number, than do the problem.
1
x
4
1
4
x
13
12
=
Round 13 to 12 (easier
to work with the 4)
3
Ex 2: Round the fractions, than do the problem.
1
7
x
3
8
Rounds up to
1.
Rounds to ½.
1
2
x
1
=
1
2
7-2: Multiplying Fractions
How do I do it?
Step 1: Multiply across.
1
1 = 1
x
3
4
12
2
3 = 6
x
35
5
7
7-3: Multiplying Mixed Numbers
How do I do it?
2
1
2
x
2
1
4
Step 1: Convert to Improper Fractions
5
2
9
x 4
Step 2: Multiply. Reduce and Convert if Needed.
5
2
9
45
x 4 = 8
45
=
8
5
5
8
7-4: Dividing Fractions
How do I do it?
1
8
3
4
Step 1: Change the 2nd number to its reciprocal (reverse.)
1
8
x
4
3
Step 2: Multiply. Reduce if needed.
1
8
x 4 = 4
3
24
=
Reduce
1
6
7-5: Dividing Mixed Numbers
How do I do it?
5
1
1
2
3
4
Step 1: Change the fractions to improper fractions. Then change the 2nd number to its
reciprocal (reverse.)
11 x
2
4
7
Step 2: Multiply. Reduce the fraction and convert it if needed.
11
4
44
x 7 = 14
2
44
=
14
Reduce
22
=
7
3
1
7
7-6: Patterns and Function Sequences
How do I do it?
16, 24, 32, 40, __, __
Step 1: Look for the pattern. Make sure that the pattern works past the first 2
numbers.
16, 24, 32, 40, __, __
+8
+8
+8
Following the pattern of +8, the next two numbers
are 48 and 56.