Adding and Subtracting Rational Numbers math7chapter1

Integers

100

-12 + 19

7

200

-15 + -6

-21

300

11 - (-4)

15

400

-2 - (-10)

8

500

5 + (-7) - (-8)

6

Fractions

100

-5/9 + -2/9

-7/9

200

11 8/9 – 6 2/9

5 2/3 or 17/3

300

6 1/3 + (-4 5/6)

1 1/2 or 3/2

400

8 3/4 + -10 2/3

-1 11/12 or -33/12

500

-12 + ¾ - 3/5

-11 7/20 or -227/20

Decimals

100

-26.3 +.26.3

0

200

-15.8 – 15.8

-31.6

300

3.6 + (-1.7)

1.9

400

33.07 + -17.54

15.53

500

-4.4 – (9.6) + 4.4

-9.6

Mixed Rational Numbers

100

2.5 + -3/4

1.75 or 1 ¾ or 7/4

200

-4.85 – 7 3/5

-12.45 or -12 9/20 or -249/20

300

19/20 – 0.50 

= 9/20 or 0.45

400

-5.5 + 5 ½  - 6

-6

500

7.34 – 5 ¾ - 10

-8.41 or -8 41/100 or -841/100

Rules

100

What are the two rules for adding Integers? for example

4 + -5 

-7 + -8

Same signs add, different signs subtract

200

When adding and subtracting decimals you must make sure to . . .

line up the decimals

300

How can someone subtract or take away a negative, just like in this expression. -9 - (-4), your answer must describe what kcc is doing or show the new operation with the integer

by adding the opposite or +4

400

When there are mixed numbers, what should you do to ensure you will use the correct numerators, just like in this expression: 

2 1/3 - 5 2/5

Turn mixed number into an improper fraction

500

When working with fractions the answer must always be 

Simplified