Integer practice (add and subtract) ppt
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This document provides rules and examples for adding and subtracting integers. It states that when adding integers with the same sign, you add the numbers and the answer takes the sign of the larger number. When adding integers with different signs, you subtract the numbers and the answer takes the sign of the larger number. The document provides examples of integer addition and subtraction problems. It also discusses multiplying integers and how the sign of the answer depends on whether you are multiplying two positives, two negatives, or a positive and a negative.
Integer practice (add and subtract) ppt
- 1. INTEGERSINTEGERS By: Andrea Bonde & Slideshare.net
- 3. Rules For Adding & Subtracting Integers • When Signs are the same, add the numbers! -4 - 3 = 4 + 3 • Answer gets the sign of the larger number. 4 is the largest number it’s sign is a (-). Answer is -7.
- 4. • When Signs are the different subtract the numbers. -4 + 3 = 4 - 3 • Answer gets the sign of the larger number. 4 is the largest number it’s sign is a (-). Answer is -1. Rules For Adding & Subtracting Integers
- 5. Let’s Practice 1) 4 - 5 = 2) -9 + 2 = 3) 4 + 5 = 4) -7 + 4 = 5) 10 - 9 = Remember: If signs are the same add the numbers, if signs are different subtract the numbers. Then give the answer the sign of the largest number! -1 -7 +9 -3 1
- 6. Let’s Practice Cont. 1) 3 - 5 = 2) -9 + 6 = 3) 8 + 5 = 4) -9 + 4 = 5) 10 - 11 = Remember: If signs are the same add the numbers, if signs are different subtract the numbers. Then give the answer the sign of the largest number! -2 -3 +13 -5 -1
- 7. Rules for Integers • When Parenthesis ( ) are involved we get to doodle! • This is where you need to draw some faces. (Bet you didn’t know you’d be doing Art in Math!)
- 8. Rules for Adding & Subtracting Integers Continued • When you multiply a (+ x -) you get a (-). • When you multiply a (- x -) you get a (+). • When you multiply a (+ x +) you get a (+). 7 + (-1) = 6 7 – (-1) = 8 7 + (+5) = 12 - + +
- 9. Let’s Practice 1) 3 – (-5) = 2) 8 + (-7) = 3) 7 – (+2) = 4) 6 – (-7) = 5) 5 + (+3) = Remember: DRAW the faces first! If signs are the same add the numbers, if signs are different subtract the numbers. Then give the answer the sign of the largest number! 8 1 5 13 8 + - + - +
- 10. Let’s Practice Cont. 1) 5 + (-3) = 2) 3 – (-5) = 3) 1 – (+3) = 4) 5 – (-4) = 5) 7 – (-5) = Remember: DRAW the faces first! If signs are the same add the numbers, if signs are different subtract the numbers. Then give the answer the sign of the largest number! - + + - + 2 8 -2 9 12
- 11. Let’s Review…
- 12. What is an integer?
- 13. ANSWER • An integer is a positive or negative whole number, including 0.
- 14. Can you give an example of an integer?
- 15. ANSWER • …-3, -2, -1, 0, 1, 2, 3…
- 16. What are the four operations?
- 17. ANSWER • The four operations are: addition, subtraction, multiplication, and division.
- 18. When signs are the same you?
- 19. ANSWER • Add the numbers • Answer gets sign of the larger number.
- 21. ANSWER • You subtract the numbers • Answer gets sign of the larger number.