## Tuesday, November 29, 2011

### Sarah's Scribe: Math Homework Book Answers (4.3, questions 6, 4)

4. What is the percent of each number? Give you answer to the nearest hundredth.

Step 1 : Find out what 1/5% is as a decimal. To do this we take 1 and divide it by 5 that equals 0.2% (1 ÷ 5 = 0.2)

Step 2 : Then find out what 0.2% is as a decimal. To do this we take 0.2 and divide it by 100, that equals 0.002. (0.2 ÷ 100 = 0.002)

Step 3 : Then you take 0.002 and multiply that by 630. And your answer is 1.26.

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~

Step 1 : Find out what 7/8% is as a decimal. To do this we take 7 and divide it by 8 that equals 0.875% (7 ÷ 8 = 0.875)

Step 2 : Then add 23 with 0.875. (23 + 0.875 = 23.875)

Step 3 : Then find out what 23.875% is as a decimal. To do this we take 23.875 and divide it by 100, that equals 0.23875 (0.23875 ÷ 100 = 0.23875)

Step 4 : Then you take 0.23875 and multiply that by 300. And your answer is 71.625 (0.23875 x \$356.80 = 71.625)

Step 5 : Round 71.625 to the nearest hundredth. (71.625 ≈ 71.63)

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~

Step 1 : Find out what 245% is as a decimal. To do this we take 245% and divide it by 100, that equals 2.45 (245 ÷ 100 = 2.45)

Step 2 : Then you take 2.45 and multiply that by \$356.80. And your answer is 874.16 (0.23875 x \$356.80 = \$874.16)

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~

Step 1 : Find out what 3/4% is as a decimal. To do this we take 3 and divide it by 4 that equals 0.75% (3 ÷ 4 = 0.75)

Step 2 : Then add 68 with 0.75. (68 + 0.75 = 68.75)

Step 3 : Then find out what 68.75% is as a decimal. To do this we take 68.75 and divide it by 100, that equals 0.6875 (68.75 ÷ 100 = 0.6875)

Step 4 : Then you take 0.6875 and multiply that by 700. And your answer is 501.875 (0.6875 x 700 = 501.875)

Step 5 : Round 501.875 to the nearest hundredth. (501.875 ≈ 501.875)

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~

Step 1 : Find out what 360% is as a decimal. To do this we take 360% and divide it by 100, that equals 3.60 (3.60 ÷ 100 = 3.60)

Step 2 : Then you take 3.60 and multiply that by \$129.95. And your answer is \$467.82 (3.6 x  \$129.95 = \$467.82)

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~

6. Table salt is a chemical compound of sodium and chlorine. Recommended daily intake is about 1700mg. If Canadians consume 182% of this amount on average, how much sodium is one person eating daily?

Step 1: Find out what 1% of 1700mg is. To do this, you take 100% and divide by 100 (100  ÷ 100 = 1)

Step 2 : Then divide 1700mg by 100 (1700 ÷ 100 = 17)

Step 3 : Then take 1% and multiply it by 182, to get 182%. (1% x 182 = 182)

Step 4: Then multiply 17mg by 182 as well. (17mg x 182 = 3094)