 # Find the value of each expression. 1. 2. 4.7 + 5.08 3. 4. 5. 10 – 3.58.

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Find the value of each expression. 1. 2. 4.7 + 5.08 3. 4. 5. 10 – 3.58

 Rational Number: ◦ a fraction made from integers  Sum: ◦ ADD  Difference: ◦ Subtract  Rounding: ◦ Choose easy #’s close to hard #’s.

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 #)

 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.  

Estimate the value of.  Each fraction is more than 1 unit from zero so round to the nearest integer.  

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?

Describe a time when you used estimating in a situation outside of math class.

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