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18 - Make Your Own Compatibles

The document is a lesson on creating compatible numbers for mental math practice. It includes various exercises for students to make their own compatible pairs and solve addition problems. Additionally, it provides two 'Power Builder' sections with multiple problems to enhance mental math skills.

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kathrojurajendra2016
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11 views2 pages

18 - Make Your Own Compatibles

The document is a lesson on creating compatible numbers for mental math practice. It includes various exercises for students to make their own compatible pairs and solve addition problems. Additionally, it provides two 'Power Builder' sections with multiple problems to enhance mental math skills.

Uploaded by

kathrojurajendra2016
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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.

LESSON 18 MAKE-YOUR-OWN COMPATIBLES o

25 + 7<?

Look compatible numbers.


for
If they aren't there make your own! . . .

You can do it by Or you can round up


breaking up one number . . then adjust the tota

TRY THESE IN YOUR HEAD.


Make your own compatible pairs.

3. 47+150 7. 148 + 50

S3) 4. 25 + 79 8. 350 + 72
1. 75 + 28 5. 175 + 22 9. 328 + 25
2. 25 + 29 6. 226 + 75 10. 235+17
MENTAL MATH IN THE MIDDLE GRADES
Copyright @ 1 987 By Dale Seymour Publications
67
MENTAL MATH IN THE MIDDLE GRADES LESSON 18 MAKE-YOUR-OWN COMPATIBLES

POWER BUILDER A
1. 25 + 28 = 11. 25 + 49 =

2. 25 + 77 = 12. 58 + 75 =

3. 75 + 26 = 13. 149 + 50 =

4. 75 + 78 = 14. 275 + 28 =

5. 25 + 27 = 15. 29 + 125 =

6. 27 + 75 = 16. 58 + 225 =

7. 175 + 29 = 17. 98 + 25 = .

8. 225 + 78 = 18. 197 + 75 =

9. 175 + 58 = 19. 75+ 19 = _

10. 57 + 75 = . 20. 225 + 49 =

oo
Think of the smallest two-digit odd number.
THINK IT Double it. Add 18. Subtract 15.
THROUGH What is the result?

Copyright © 1987 By Dale Seymour Publications

MENTAL MATH IN THE MIDDLE GRADES LESSON 18 MAKE-YOUR-OWN COMPATIBLES

POWER BUILDER B
1. 75 + 28 = 11. 25 + 48 =

2. 25 + 26 = 12. 75 + 56 =

3. 75 + 77 = 13. 375 + 28 =

4. 25 + 29 = 14. 147 + 75 =

5. 28 + 25 = 15. 125 + 28 =

6. 26 + 75 = 16. 98 + 75 = _

7. 78 + 25 = 17. 199 + 75 =

8. 175 + 57 = 18. 23+ 175 =

9. 59 + 175 = 19. 49 + 325 =

10. 157 + 75 = 20. 78 + 175 =


oo
THINK IT Think of the largest two-digit even number.
THROUGH Subtract 38. Add 25. Subtract 45. Add 15.
Subtract 55. What is the result?

68 Copyright © 1987 By Dale Seymour Publications

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