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ADDING OF INTEGERS WITH UNLIKE SIGNS

ADDING OF INTEGERS WITH UNLIKE SIGNS. DRILL ON ADDING INTEGERS WITH LIKE SIGNS. Perform the indicated operations. + 8 + + 7 + 4 + + 3 + + 2 + 6 + + 4 + + 18 + 45 + + 87 + + 52

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ADDING OF INTEGERS WITH UNLIKE SIGNS

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  1. ADDING OF INTEGERS WITH UNLIKE SIGNS

  2. DRILL ON ADDING INTEGERS WITH LIKE SIGNS Perform the indicated operations. • + 8 + +7 • +4 + +3 + +2 • +6 + +4 + +18 • +45 + +87 + +52 • Sally earned a profit PhP 78 for selling banana chips and PhP 35 for selling turon. If she already saved PhP120 last week, how much is her money now?

  3. DRILL ON ADDING INTEGERS WITH LIKE SIGNS Perform the indicated operations. • -8 + -5 • -5 + -6 + -4 • -12 + -9 + -3 • -45 + -26 + -14 • The temperature dropped by -2̊C. After 30 minutes, it dropped again by -4C. Then, after an hour, it went down by -3C. What is the current temperature?

  4. RULE FOR INTEGER MODELS • A zero pair is formed by pairing one positive and one negative counter. • It has a zero value. - +

  5. RULE FOR INTEGER MODELS • We can add zero pairs to a set because adding zero does not change the value of the set. - - + + + + +

  6. RULE FOR INTEGER MODELS • We can remove zero pairs to a set because removingzero does not change the value of the set. - - + + + + +

  7. RULE FOR INTEGER MODELS • We can remove zero pairs to a set because removingzero does not change the value of the set. - - + + + + +

  8. NET COUNTER • Once you have removed the zero pairs, you get a net counter. - - + + + + +

  9. NET COUNTER • Once you have removed the zero pairs, you get a net counter. - - + + Net counter = +3 + + +

  10. - - - - - - - + + +

  11. - - - - - - - + + Net counter = -4 +

  12. PRACTICE Using the chips, what is the net counter on each given. • +5, -3 • -4, +1 • +8, -5 • +6, -6

  13. PRACTICE Using the chips, what is the net counter on each given. • +5, -3 • -4, +1 • +8, -5 • +6, -6

  14. ADDING INTEGERS WITH UNLIKE SIGNS • Use the concept of counters. Add -2 and +5 -2 + +5 = __ - - + + + + +

  15. ADDING INTEGERS WITH UNLIKE SIGNS • Use the concept of counters. Add -2 and +5 -2 + +5 = __ +3 - - + + + + +

  16. USING CHIPS • To add integers with unlike signs, remove all the zero pairs first. • The number of integers left is the sum.

  17. PRACTICE Using the chips, what is sum of the following. • +5 + -3 • -4 + +1 • +4 + -6 • +7 + -7 • +3 + -4

  18. USING A NUMBER LINE -5 -4 -3 -2 -1 0 1 2 3 4 5 Add +5 and -2 +5 + -2 = __ +3

  19. USING A NUMBER LINE -5 -4 -3 -2 -1 0 1 2 3 4 5 Add -5 and +2 -5 + +2 = __ -3

  20. USING NUMBER LINE • To add integers with unlike signs, plot the first addend on the number line. • Then, - using the (-) sign , move the number of units to the left; - using the (+) sign, move the number of units to the right. • The sum is the integer where you stop / land.

  21. PRACTICE Using the number line, what is sum of the following. • +5 + -3 • -3 + +5 • +4 + -6 • +5 + -5 • +6 + -10

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