Decimals and Fractions

Rules

100

When adding/subtracting fractions, do you need common denominators?

Yes

200

When multiplying decimals, how do you know how many decimals will be in the product?

Count how many decimal places in each of the numbers

300

When dividing decimals, which one needs to be the whole number, inside or outside?

The outside

400

When adding/subtracting fractions, do we need to convert mixed numbers to fractions greater than 1?

No

500

When dividing fractions, which one do you find the reciprocal for, first or second?

Second

Fractions 1

100

Add 1/2 + 3/4 in simplest form as a mixed number or fraction greater than 1

5/4 or 1  1/4

200

Multiply 1/2 • 3/4 in simplest form

3/8

300

Subtract in simplest form 7/10 - 1/5

1/2

400

Divide 2 1/8 ÷ 1 1/4 in simplest form as a mixed number or fraction greater than 1

1  7/10 or 17/10

500

Add 1/3 + 2/6 + 3/5 in simplest form as a mixed number

1  4/15

Decimals 1

100

Add the decimals: 1.46 + 1.21

2.67

200

Add the decimals: 1.5 + 2.03 + 0.6

4.13

300

Multiply 4.52 • 2

9.04

400

Divide the decimals: 24.6 divided by 2

12.3

500

Divide the decimals: 45.6 divided by 0.3

152

Fractions 2

100

Subtract the fractions 6/12 - 4/12 in simplest form

1/6

200

Divide in simplest form 5/6 ÷ 5/8 as a mixed number or fraction greater than 1

1  1/3 or 4/3

300

Add the fractions 2 3/5 + 3 1/2 in simplest form as a mixed number

6  1/10

400

Subtract the fractions 2 1/8 - 1/4 in simplest form as a mixed number

1 7/8

500

Divide in simplest form 1 1/2 ÷ 3

1/2

Decimals 2

100

Subtract 5.2 - 3.52

1.68

200

Add 3.25 + 1.2

4.45

300

Multiply 1.3 x 2.21

2.873

400

Divide the decimals: 6.21 divided by 0.3

20.7

500

Find 32 - 8.26 + 2.1

25.84