find the value of each expression. 1. 2. 4.7 + 5.08 3. 4. 5. 10 – 3.58
TRANSCRIPT
Find the value of each expression.
1.
2. 4.7 + 5.08
3.
4.
5. 10 – 3.58
4
3
2
1
21
52 12
7
28
Rational Number: ◦ a fraction made from integers
Sum:◦ ADD
Difference:◦ Subtract
Rounding:◦ Choose easy #’s close to hard #’s.
8
5
6
11
4
3
Decimals less than one◦ round to 0, 0.5 or 1
more than one ◦ round to the nearest integer (whole #)
Fractions less than one ◦ round to 0, ½ or 1
mixed numbers ◦ round to the nearest integer (whole #)
Let’s Try Some Rounding… 0.2 rounds to ________ 0.4 rounds to ________ 0.7 rounds to ________ 0.75 rounds to ________ 1.6 rounds to ________
¼ rounds to _________ 1/3 rounds to _________ 3/5 rounds to _________ 1 ¾ rounds to _________
Estimate the value of – 4.23 + 2.8.
Both numbers are more than one and should be rounded to nearest integer.◦– 4.23 → – 4◦2.8 → 3
– 4 + 3 = –1
– 4.23 + 2.8 ≈ –1
Estimate the value of 0.94 – (–0.43).
Both numbers are less than one unit away from zero and should be rounded to the nearest 0.5.◦0.94 → 1◦– 0.43 → – 0.5
1 – (–0.5) = 1 + 0.5 = 1.5
0.94 – (–0.43) ≈ 1.5
Estimate the value of .
Each fraction is less than 1 unit from zero so round to the
nearest .
9
4
7
1
2
1
9
4
07
1
2
1
2
10
2
1
2
1
9
4
7
1
Estimate the value of .
Each fraction is more than 1 unit from zero so round to the nearest integer.
87
31 21
32
11
87
31
4)3(131
421 87
31
Estimate the value of each expression.
1. 3.21 + 6.3
2.
3.
4. 0.13 – 0.925
5. Matt bought pounds of apples, pounds of grapes and pounds of
potatoes. How many pounds did he buy?
10
9
7
3
32
41 28
1212 6
51 324
Describe a time when you used estimating in a situation outside of math class.