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.    

         

Quick Reminder

Just wanted to post a quick reminder about the Unknown Numbers test that we are having tomorrow. 

We will be starting the Nervous System tomorrow, and the notes will be posted for those as well. There will be a test on the Digestive and Nervous systems on Wednesday the 19th. 

Have a wonderful afternoon and thanks for visiting! If you have any questions, comments, or concerns feel free to send an email or leave a friendly comment below! 

Unknown Numbers

Unknown Numbers

Today we went began going over unknown numbers once again and in more detail.

An unknown number is like(21÷n=3) (5 x H=10) (R÷8=2) (9x6=k)

We are teaching them to know whether or not they need to multiply or divide by looking at what numbers they have.

If they have the dividend(the 21 in the example above) or the product (the 10 in the above example), then they have to divide. (21÷3=n) (10÷5=H)

If they have divisor (the 8) and the quotient (the 2), or both factors (the 9 and 6) then they would multiply to find the answer. (8x2=R) (9x6=k)

On my each of my walls I have added two artifacts for them to look out throughout the lesson. These look like the following:

Dividend--->Divisor/Quotient--->Divide

Factor--->Product--->Divide

Divisor--->Quotient--->Multiply

Factor--->Factor-->Multiply

And:




21 ÷    3 =   7
^                  ^            ^
Dividend           Divisor       Quotient

3 x   7 = 21

^            ^          ^

Factor         Factor      Product

If you have any questions, concerns, or ideas, please feel free to email me or leave a friendly comment below! Thank you for viewing!