Integers
-12 + 19
7
-5/9 + -2/9
-7/9
-26.3 +.26.3
0
2.5 + -3/4
1.75 or 1 ¾ or 7/4
Part 1: What is the sign of the sum of two negative numbers?
Part 2: What is the sign of the sum of two positive numbers?
Part 1: negative
Part 2: positive
2 ____ | -5 |
2 < | -5 |
-15 + -6
-21
11 8/9 – 6 2/9
5 2/3 or 17/3
-15.8 – 15.8
-31.6
-4.85 – 7 3/5
-12.45 or -12 9/20 or -249/20
How can you know what the sign will be for the sum of a positive and negative number?
The answer will have the sign of the bigger digit.
0.4 ____ |-7/8|
0.4 < |-7/8|
11 - (-4)
15
6 1/3 + (-4 5/6)
1 1/2 or 3/2
3.6 + (-1.7)
1.9
19/20 – 0.50
= 9/20 or 0.45
How do you change a subtraction sentence into an addition sentence?
By adding the opposite.
Keep, Add, Opposite
- |6| =
-6
-2 - (-10)
8
8 3/4 + -10 2/3
-1 11/12 or -33/12
33.07 + -17.54
15.53
-5.5 + 5 ½ - 6
-6
When adding and subtracting fractions, you must have a what?
common denominator
Find the distance between -3 and 9 on a number line.
12 units
5 + (-7) - (-8)
6
-12 + ¾ - 3/5
-11 7/20 or -227/20
-4.4 – (9.6) + 4.4
9.6
7.34 – 5 ¾ - 10
-8.41 or -8 41/100 or -841/100
When signs are different, you find the (1) __________
of the digits by (2) _______________.
When signs are the same, you find the (3) ________ of the digits by (4) _______________.
(1) difference
(2) subtracting
(3) sum
(4) adding
Find the distance between -7.5 and -15.3 on the number line.
7.8