First_Review_Grade 5

First_Review_Grade 5

by Fely Rose Cayetano

Multiple Choice

What is the divisibility rule for 4?

• The last two digits form a number divisible by 4

• The last digit is even

• The last digit is a number divisible by 4

• The last digit is zero

Multiple Choice

What is the divisibility rule of 3?

• The last two digits form a number divisible by 3

• The last digit is a 3

• The last digit is zero

• The sum of the digits is a number divisible by 3

Multiple Choice

What is the divisibility rule for 6?

• It is divisible by 2 and 4

• It is divisible by 3 and 4

• It is divisible by 2 and 3

• The last digit is zero

Multiple Choice

How do you know if a number is divisible by 12?

• The sum of the digits must be a multiple of 12

• If it is divisible by 3 and 4

• If it ends in 3, 6, or 9

• If it is divisible by 2 or 3

​The Order Of Operation (PEMDAS)

​Parentheses

• ​Use PEMDAS inside parentheses until there only 1 number inside.

​Exponents

• ​Evaluate any exponents

​Multiply/Divide

• ​Do whichever comes first when reading from left to right

​Add/Subtract

• ​Do whichever comes first when reading from left to right

Multiple Choice

Evaluate the following expression.

10 + 45 ÷ 3 

• 18

• 25

• 15

• 55

Multiple Choice

What would be my first step? 3 + 4 x 6 - 4 =

• Multiplication

• Addition

• Subtraction

• Division

Multiple Choice

Which operation would you do first in the following equation?

10 - 4 ÷ 1 x 5

• Multiplication

• Addition

• Subtraction

• Division

​What are Factors?

• -Numbers that you multiply together to make a product

• -Products are answers to multiplication problems.

• -3 and 5 are factors of 15 because 3 x 5 =15

• -15 is the product of the FACTORS 3 and 5.

Multiple Choice

What are the factors of 12?

• 1 and 12

• 1, 2, 3, 4, 6, & 12

• 1, 2, 3, 4, & 6

• 1, 2, 3, 4, 6, 10, & 12

​​What are Prime numbers?

​

• ​Whole numbers greater than 1 that only have two factors, 1 and itself

• ​Prime numbers are only divisible by 1 or itself

• ​Example: 2 is prime because the only two factors are 1 and 2,

• (1 x 2 = 2): 11 is prime number because the only two factors are 1 and 11

• (1 x11=11).

• ​Can you list the first 10 prime numbers?

Open Ended

What are the first 10 prime numbers?

​​Greatest Common Factor (GCF)

​

• ​The greatest shared factor between two numbers.

• ​You can use prime factorization as a strategy to find the GCF of 2 numbers.

• ​The GCF of two numbers will always be the smaller of the two numbers or less

Multiple Choice

What is the GCF of 20 and 30?

• 5

• 10

• 2

• 20

​GCF Word Problems

​Key words

​

Like all good word problems there are key words we can look for when solving greatest common factor word problems. The most common question or phrase you will see is "What is the greatest number...?"

​

You may also see "what is the largest?" or "what is the maximum?" basically anything synonymous with greatest.

Key words continue

​

Another important phrase to look for in word problems is "distributed evenly", or "having nothing left over". This tells us that we are looking for factors that go in evenly!

​Lily is creating party favors with stickers and pencils. She has 16 stickers and 12 pencils, and she wants each party favor to include the same combination of pencils and stickers, with none left over. What is the greatest number of party favors she can make?

​​Solve the problem

Use the list method (as shown in the picture) or the prime factorization method to solve.

Multiple Choice

A choir teacher is dividing 20 sopranos and 8 altos into singing groups. He wants each group to have the same combination of sopranos and altos, with no singers left over. What is the greatest number of groups he can make?

• 4

• 8

• 2

• 10

​LCM

​• Least Common Multiple

• list the multiples of both numbers

• skip count or times table chart

• find the LOWEST the numbers have in common

Multiple Choice

What is the LCM of 7 and 8? 

• 7

• 42

• 8

• 56

Multiple Choice

What is the LCM of 2, 4, 6?

• 6

• 4

• 12

• 2

Addition of Similar Fractions

​To add similar fractions you will need to do is

​

1.Check if the denominator if it's same

2.Add the numerators not the denominators

3.Copy The Denominator

4.Express the answer in simplest form if needed.

Multiple Choice

$$\frac{2}{6}+\frac{3}{6}$$  

• $$\frac{5}{12}$$  

• $$\frac{6}{12}$$  

• $$\frac{5}{6}$$  

• $$\frac{4}{6}$$  

Multiple Choice

$$\frac{2}{10}+\frac{4}{10}+\frac{4}{10}$$  

• $$\frac{9}{10}$$  

• $$\frac{10}{30}$$  

• $$\frac{1}{3}$$  

• $$1$$  

Addition of Dissimilar Fractions

​To add dissimilar fractions you will need to do is

​

1.Change to similar fractions (by getting the LCD).

2.Add the numerators then copy the denominator.

3.Express the answer in simplest form if needed.

Multiple Choice

$$\frac{2}{5}+\frac{1}{7}$$  

• $$\frac{19}{35}$$  

• $$\frac{3}{12}$$  

• $$\frac{18}{35}$$  

• $$\frac{3}{35}$$  

Multiple Choice

$$\frac{3}{4}+\frac{2}{8}$$  

• $$\frac{5}{12}$$  

• $$\frac{32}{48}$$  

• $$1$$  

• $$\frac{5}{32}$$