1. Lesson 2.3 Subtracting Rational Numbers
Day 1
Lesson 2.3 Subtracting Rational Numbers
Students will be able to subtract rational numbers
CCSS.7.NS.1d

2. Warm-Up #26 (10/25/16)
− =
10.34 – 13.4 =
Classify Is it a rational number? Is it an integer?

3. Homework (10/25/16)
Textbook: Big Ideas Page 62 #3-12 ALL

4. Homework Solutions
5. −9 5 =− − = = 1 4
13. Line up the decimals wrong
14. Add wrong

5. Example 1 Change subtraction to adding the opposite.
Get a common denominator.
Subtract and keep sign of the larger number.

6. Example 2 Change subtraction to adding the opposite.
Get a common denominator and subtract.

7. EXAMPLE 3 3 4 1 3 - 9 12 -4 12 5 12 + =

8. EXAMPLE 3 4 1 3 - 4 12 -9 12 -5 12
9 – 4 = 5 ( KEEP SIGN OF THE LARGER NUMBER) = +

9. EXAMPLE 4 3 4 -1 5 -

10. EXAMPLE 3 4 -1 5 - 3 4 1 5 +

11. 3 4 -1 5 3 4 1 5 15 20 4 20 EXAMPLE - + COMMON DENOMINATOR TO +
SUBTRACT FRACTIONS +

12. EXAMPLE 3 4 -1 5 - 3 4 1 5
= 19 (KEEP THE SIGN OF THE LARGER NUMBER) + 15 20 4 20 19 20 = +

13. Example 5 -3 4 -1 5 -

14. -3 4 -1 5 - -3 4 1 5 +

15. -3 4 -1 5
If the BIGGER number is FIRST then the result = NEGATIVE - -3 4 1 5 +
-15 20 4 20
COMMON DENOMINATOR TO
SUBTRACT FRACTIONS +

16. -3 4 -1 5
If the BIGGER number is FIRST then the result = NEGATIVE - -3 4 1 5 +
-11 20
-15 20 4 20
= 11 (KEEP THE SIGN OF THE LARGER NUMBER) = +

17. Example 6
13 – (1.34) =

18. Example 7
-3.42 – 45.2 =

19. Extra Practice

20. Extra Practice

21. Comparing Rational Numbers
Day 2
Comparing Rational Numbers
Students will be able to compare rational numbers.
CCSS.7.NS.1d

22. Homework (10/26/16)
Worksheet: Compare 2 Circles and Lines

23. Homework Solutions
= −20 3 =− − =−
12. Did not have common dominator

24. Find the solution 6.5 – 9.3 = ?
-3.2
-2.8
2.8
3.2
Answer Now

25. Find the solution
Answer Now

26. Which one has more leftover?

27. Which one has more leftover?

28. Ordering Rational Numbers
There are 2 ways to order from least to greatest:
Get a common denominator and then look at the numerator to determine which is one greater.
Change the fractions to decimals (numerator  denominator)

29. Which rational number is bigger?
1) Get a common denominator.
2) Or convert the fraction to a decimal.
< 4 1
< 3 8
THEREFORE…

30. Which rational number is bigger?7 4 or 1 6 42 24
< 44
Get a common denominator
or convert to a decimal
1.75 < 1.83
THEREFORE…

31. Stand Quietly

32. Word Problems for Adding and Subtracting Rational Numbers
Day 3
Word Problems for Adding and Subtracting Rational Numbers
Students will be able to solve real-life problems using addition and subtraction operations.

33. Warm-Up #27 (10/27/2016)
Which symbol makes this true (<, >, =)?
Evaluate 4 7 − 5 12
What is the circumference of a circle is the radius is 2 inches.

34. CH 2 Word Problems Packet Page 11 and 12 ALL
Homework (10/27/16)
CH 2 Word Problems Packet Page 11 and 12 ALL

35. Which symbol makes this true?5 7 ? 3 4
<
> =
Answer Now

36. Which symbol makes this true?-2 -1 ? 9 4
<
> =
Answer Now

37. Example 1:
Find the perimeter of a rectangle with a length of inches and a width of inches.

38. Example 2:
Tiffany fills a ounce glass from a ounce bottle of juice. How much juice is left in the bottle?

39. Example 3:
A triangle has three sides of , , 𝑎𝑛𝑑 inches. What is the perimeter of the triangle?

40. Example 4:
Nida is years old, while her sister Sally is years old. What is the sum of the ages of the sisters?

41. Quiz Time (10/28/16)
Pencil
No calculator
Take out your homework and homework log
When you are done: turn it in
When you are done: sleep, read, or draw

42. Homework (10/28/16)
CH 2 Word Problems Packet Page 15 and 16 ALL

43. Homework (10/28/16) 8.
and and and and 0.601

44. Partner Work_Classwork_10 points
Write down name and table number
Write down the question on the paper
Underline important information
Show work, simplify, and box in the answer
Include picture(s) to go with the problem
Need to have both handwrittings

45. Stand Quietly

46. Warm-Up #28 (10/31/16)
− 3 6 +(− 3 8 ) = =

47. Homework (10/31/16)
Quiz #5 Correction