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Memorizing Addition and Subtraction Facts: 1 of 5

Home > Resources > Addition and Subtraction Facts > Number +1 & Doubles

The two "tricks" below are taken from Two Plus Two is Not Five by Susan Greenwald, MA Ed. You can find more about the workbook and author here.

Work through the two tricks below with your child and then use the links to the worksheets and fact cards for practice and review.

Trick: Number +1

Can you count to 10?

Tell what comes next:

1 , ____ 3 , ____ 5 , ____ 7 , ____ 9 , ____
4 , ____ 7 , ____ 2 , ____ 8 , ____ 6 , ____
9 , ____ 5 , ____ 6 , ____ 4 , ____ 3 , ____

What is one more? Write the greater numbers.

3                        
2   3   7   9   4   6   1
                         
                         
8   5   6   3   9   5   7

Go up like an elevator.

9+1= 10
8+1= 9
7+1= 8
6+1= 7
5+1= 6
4+1= 5
3+1= 4
2+1= 3
1+1= 2
0+1= 1

Practice Number +1 with your child. You can use this printable worksheet on which you can try the above steps as well as answer questions using the Number +1 trick.

Carry out the following two steps:

1. Look at the examples below and then try this worksheet to practice more with the Number +1 trick.

Look. These are the same.
3
 
 
 
1
 
6
 
 
 
 
 
 
1
 
+ 1
 
+ 3
 
 
 
+ 1
 
+ 6
 
 
 
 
 
 
4   4   7   7  

2. After completing the worksheets you can use these flashcards to help review and memorize the +1 and 1+ facts.


Trick: Doubles

illustration of adding 2 + 2 and 5 + 5 using fingers

2
+ 2
1
+ 1
5
+ 5
2
+ 2
5
+ 5
1
+ 1
5
+ 5

Review the Doubles above and then try the following three steps:

1. Practice Doubles and Number +1 together on this printable basic facts worksheet.

Look. These are the same.
5 5 + 5 = 10 2 2 + 2 = 4
+ 5   + 2  
10   4  

2. Look at the two different ways above to write the same addition fact. Both ways mean the same thing. Remember this when you try this worksheet to practice Doubles and Number +1.

3. After completing the worksheet, print out and use these flashcards to help review and memorize some of the doubles facts.

Next Trick: Backwards 1 >>

Click to learn more about this Addition Facts Workbook
These strategies for helping to memorize addition and subtraction facts were developed by Susan Greenwald, MA Ed. and are taken from the beginning of her Two Plus Two is Not Five workbook. Susan has written three books on teaching math facts and is a sought-after speaker and presenter.

You'll find more about Susan and her work here.


The information on this page is Copyright © 2006 by Susan R. Greenwald All Rights Reserved

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