More or less
Addition
Subtraction
Explanation
100
10 less than 175 is
165
100
430 + 200
630
100
820 - 200
620
100
Why is it important to explain your thinking? 
Responses will vary.
200
10 more than 252 is 
262
200
520 + 470 
990
200
750 - 160
590
200
How do you explain your thinking? 
By writing complete sentences. 
300
200 more than 439 is 
239
300
456 + 244
700
300
693 - 256
437
300

26 + 36 = 62. 

Explanation: 6 + 6 is 12. 3 + 2 + 1 is 6. 

What is wrong with my explanation? 
I did not explain why I did what I did. I did not use complete sentences. 
400
300 less than 752 is
452
400
127 + 629
752
400
987 - 499 
488 
400

26 + 36 = 62.

Explanation: 6 + 6 is 12. 3 + 2 + 1 is 6. 


Fix my explanation! 

I added 6 + 6 which equals 12. I carried the tens over to the tens place and left the 2 in the ones place. I added the numbers in the tens place, including the one that I carried over. My answer is 62. 
500
627 is ______ more 427
200
500
654 + 147
801
500
767 - 298
469
500
Complete this problem and explain your thinking in complete sentences. 


147 + 168

315. 

Explanations will vary. 

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