Adding Subtracting Multiplying and Dividing Fractions and Decimals

When adding or subtracting with decimals, you -

• Move decimals out

• Shift decimals 3 places over

• Line up the decimals

• Ignore decimals

When adding or subtracting fractions, you -

• use our 4-box method

• only add/subtract numerators & add/subtract denominators

• keep change flip

• do not need to find common denominators

Jim has a 25-acre farm. He planted 6 7/10 acres with corn and 4.6 acres with wheat. He used

the rest as grazing land. How many acres does Jim have for grazing land?

• 13.7 acres

• 11.3 acres

• 8.8 acres

• 36.3 acres

When multiplying with decimals, you -

• line up the decimals

• "Raise the roof"

• "Slide & Slide"

• bump out the decimals, multiply, & bump them back in

When multiplying fractions, you -

• multiply the numerators & multiply the denominators

• keep change flip

• find common denominators

• do not have to reduce

When dividing with fractions, you -

• divide across top and bottom

• find common denominator

• keep change flip

• reduce

When do you use "Keep Change Flip"?

• multiplying fractions

• dividing fractions

• multiplying integers

• dividing integers

Convert to fraction in simplest form 0.8

• 4/5

• 8/100

• 4/10

• 16/20

11.3 × 2.5

• 79.1

• 13.8

• 22.597

• 28.25

0.52 x 40

• 2080

• 208

• 20.8

• 2.08