1. Internalizing The Closure Property Grades 3 – 5
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Internalizing
The Closure Property
Grades 3 – 5
© 2012 Math as a Second Language All Rights Reserved

2. Remind the students of the Closure Property.
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To the Teacher
Remind the students of the Closure Property.
The Closure Property For Addition
If a and b are whole numbers, then a + b
is also a whole number.
The Closure Property For Multiplication
If a and b are whole numbers, then a × b
is also a whole number.
© Math As A Second Language All Rights Reserved

3. next
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To the Teacher
Have the students decide if each answer to the following problems is a whole number.
The students should recognize that addition and multiplication of whole numbers always produces a whole number answer, but subtraction and division do not.
© Math As A Second Language All Rights Reserved

4. Then click on the next button to continue.
Directions
Decide if each of the following problems produces a whole number answer.
Click on true or false.
Then click on the next button to continue.
© Math As A Second Language All Rights Reserved

5. 3 + 5 produces a whole number.
False
True

6. Terrific
3 + 5 = 8
(a whole number)
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7. Sorry
3 + 5 = 8
(a whole number)
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8. 5 – 3 produces a whole number.
False
True

9. Great
5 – 3 = 2
(a whole number)
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10. Sorry
5 – 3 = 2
(a whole number)
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11. 3 – 5 produces a whole number.
False
True

12. Wonderful
3 – 5 = -2
(not a whole number)
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13. Sorry
3 – 5 = -2
(not a whole number)
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14. 12 + 18 produces a whole number.
False
True

15. Terrific
= 30
(a whole number)
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16. Sorry
= 30
(a whole number)
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17. 5 × 7 produces a whole number.
False
True

18. Fantastic
5 × 7 = 35
(a whole number)
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19. Sorry
5 × 7 = 35
(a whole number)
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20. 28 ÷ 7 produces a whole number.
False
True

21. Very Nice
28 ÷ 7 = 4
(a whole number)
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22. Sorry
28 ÷ 7 = 4
(a whole number)
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23. 31 ÷ 5 produces a whole number.
False
True

24. Very Nice
31 ÷ 5 = 61/5
(not a whole number)
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25. Sorry
31 ÷ 5 = 61/5
(not a whole number)
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26. 40 ÷ 10 produces a whole number.
False
True

27. Very Nice
40 ÷ 10 = 4
(a whole number)
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28. Sorry
40 ÷ 10 = 4
(a whole number)
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29. 145 – 83 produces a whole number.
False
True

30. Wonderful
145 – 83 = 62
(a whole number)
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31. Sorry
145 – 83 = 62
(a whole number)
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32. 25 × 12 produces a whole number.
False
True

33. Fantastic
5 × 7 = 35
(a whole number)
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34. Sorry
5 × 7 = 35
(a whole number)
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35. 45 – 73 produces a whole number.
False
True

36. Great
45 – 73 = -28
(not a whole number)
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37. Sorry
45 – 73 = -28
(not a whole number)
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38. 5 ÷ 2 produces a whole number.
False
True

39. Very Nice
5 ÷ 2 = 21/2
(not a whole number)
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40. Sorry
5 ÷ 2 = 21/2
(not a whole number)
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41. Closing Reminder next next next next Adding two whole numbers always
gives a whole number answer.
Multiplying two whole numbers always gives a whole number answer.
Subtracting two whole numbers does not always give a whole number answer.
Dividing two whole numbers does not always give a whole number answer.