3rd Grade Math Study Guide

3^rd Grade 2^nd 9 Weeks Math Study Guide:

Unknown Numbers:   7 x ? = 35          36 divided ? = 6

Properties of Operation:

Commutative Property      7 x 2=    2x7=                     order does not matter

Associative Property          (3 x 5) x 2 =      5 x (3 x 2)=        order does not matter

Distributive Property        8 x 9 =

Multiplication/Division:           7 x 7=     8 x 6 =        18 divided 2 =           48 divided 8 =

Two-Step Word Problems:    Tom went to the store and bought a box of cookies that cost $5.  He also picked up a bag of apples for $6 and a pack of meat for $9.  How much change did she get back if she paid with $40?

Patterns:  Find the rule and finish the pattern.

5, 10, 15,__,___,___                                     2, 4, 8, 16,___                        3, 8, 13,__,__

Multiply by Multiples of 10:          40 x 8=                      90 x 3=            60 x 7=

Area:    Find the area of each shape.    

         

Multiply by Multiples of 10

Multiple:
A multiple of a number is the product or answer of that number and any other whole number.

(In other words)

A multiple of a number is when you multiply a set number by other numbers.
EX: 2 x 1 = 2 2 x 2 = 4 2 x 3 = 6
      2 x 4 = 8 2 x 5 = 10 2 x 6 = 12
The multiples of 2 are the answers:
2, 4, 6, 8, 10, and 12

Multiplying with base ten blocks: 

Try these!

30 x 4=

70 x 4=

40 x 5=

How to multiply by multiples of 10:

 20       Step 1: Count the zeros (0)
x 6       Step 2: Put that many 0s in your 
----             answer
 120      Step 3: Multiply the remaining                           factors

Try these!
70 x 4=

30 x 8=

90 x 7=

80 x 3=

60 x 5= 

20 x 6=