Decimal and Fraction Operations: Big Ideas Ch 2

To add or subtract fractions you need to:

• Find a common denominator

• Add or subtract the numerators and add or subtract the denominators

• Invert the second fraction

• Change the sign

Which is the correct way to rewrite $\frac{2}{3}-\frac{1}{4}$   

•  $\frac{2}{12}-\frac{1}{12}$  

• 1

•  $\frac{2}{3}+\frac{4}{1}$  

•  $\frac{8}{12}-\frac{3}{12}$  

Answer explanation

When you find a common denominator, you have to multiply both the numerator and the denominator by the same number.

 $\frac{3}{7}+\frac{2}{11}=$  

•  $\frac{5}{18}$  

•  $\frac{47}{77}$  

•  $\frac{5}{77}$  

•  $\frac{47}{18}$  

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Which TWO of these are part of multiplying decimals?

• Line up the decimals of the factors

• First put the factors as far right as possible

• Add up the decimal places in the factors

• Count from the left to put the decimal in your product

4 x 0.03

• 12

• 0.12

• 120

• 0.012

Answer explanation

Line up as if the decimals are NOT there. The answer has same number of decimals places as in the factors. ".03" has two decimal places, "4" has none, so the answer has 2 decimal places (2+0=2).

Who is this handsome boy?

• Potato

• Boris

• Pudding

• Mr. Belfor

Answer explanation

That handsome boy is Pudding! He turns seven tomorrow!

How do you multiply fractions?

• Find a common denominator and combine numerators

• Multiply straight across: numerator by numerator and denominator by denominator. Simplify your answer

• Multiply the first fraction by the reciprocal of the second fraction

• KCF

 $\frac{1}{4}\cdot\frac{1}{11}\$  

•  $\frac{1}{44}$  

•  $\frac{1}{11}$  

•  $\frac{4}{44}$  

•  $\frac{1}{22}$  
  

Answer explanation

For fraction multiplication, multiply straight across: numerator times numerator and denominator time denominator. 1 x 1 = 1 and 4 x 11 = 44

 $\frac{5}{6}\ \cdot\ \frac{1}{4}\ =$  

•  $\frac{5}{24}$  

•  $\frac{20}{6}$  

•  $\frac{6}{10}$  

•  $\frac{5}{12}$  

Tags

CCSS.5.NF.B.6

Who is this?

• Mr. Bowtie Jangles

• Pablo

• Tyrone

• Post Malone