1. Number Sense & Ratios Review
Wednesday, September 3rd, 2014
Number Sense & Ratios Review

2. Rounding Numbers
If the number you are rounding to is followed by 0, 1, 2, 3, or 4, you will round down
eg would be rounded to 38
If the number you are rounding to is followed by 6, 7, 8, or 9, you will round up
eg would be rounded to 39
If the number you are rounding to is followed by a 5* and only a 5, you will round up or down to the nearest EVEN number
eg and 38.5 would both be rounded to 38

3. Practice 1. Round to the nearest tenth. 45.67 2.93 142.988
2. Round to the nearest hundred.

4. Percents A number that is calculated “out of 100”
eg. 45% can be expressed as or 0.45
Express each percent as a fraction in lowest terms.
60% 27% 85%

5. Fractions as Percents
To express a fraction as a percent, first change the fraction to a decimal.
eg = 0.50
Next, multiply the decimal by 100.
eg x 100 = 50%
Express each fraction as a percent.

6. Ratios Ratios are a method of comparing two qualities.
eg. 4:3 would be read as 4 to 3
To reduce ratios to lowest terms you must determine the greatest common factor (GCF) and divide each number by the GCF
24: :48 6:14