Mental Math
To Bundle or Not
Name that strategy
Fill in the blank
Skip to my lou
100

What is 500 + 220 = 

What is 720.

100

582 + 108= 

Yes you will need to bundle. 

100
You will not have to bundle at all. You can line your numbers up on top of each other then add straight down. 

What is vertical method. 

100

411, 511,___, ____, 811

611, 711

100
Skip count by 10's from 20 to 80. 

20, 30, 40, 50, 60, 70, 80

200

What is 700 + 111= 

What is 811. 
200

580 + 101= 

No you will NOT have to bundle. 

200

You do have to bundle. When you show this you can easily count your chips and see the arrow. 

What is a place value chart. 

200

597, 598, ____, _____, 601, 602

599, 600

200

Skip count by 5's from 415 to 435. 

415, 420, 425, 430, 435.

300

What is 450 + 320= 

What is 770. 
300

628 + 198= 

Yes you will need to bundle. 

300

When you make a new hundred, you can circle ten tens and draw your arrow. 

What is a place value chart. 
300

873, 863, 853 _____, ____, ____

843, 833, 823.

300

Skip count by 10's from 430 to 380

430, 420, 410, 400, 390, 380

400

What is 807 + 123= 

What is 930. 

400

 506 + 210= 

No we will NOT have to bundle. 

400
When you are adding two numbers and you can make a benchmark number, this is the strategy you should choose. 

What is a number bond. 

400
____, ____, 450, 550, 650, ____

250, 350, and 750

400

Skip count by 5 from 790 to 815. 

790, 795, 800, 805, 810, 815

500

What is 208 + 412= 

What is 620. 
500

What is 197 + 413=? What place value will you have to bundle. 

Yes you will need to bundle. You will have to bundle in the one and tens. 

500
When you have two addends and you have to bundle your ones and tens, there are two strategies that you can use to double check your work! 
What is the vertical method AND a place value chart. 
500

___, 794, ____, 814, ____

784, 804, 824

500

Skip count by 5's from 250 to 225

250, 245, 240, 235, 230, 225

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