Adding & Subtracting Decimals
3.5 + 6.1
9.6
1/2 * 5/6
5/12
What is the rule for adding integers with the same sign
same sign means add the numbers and keep the sign of that number
-8 - (-9)
1
14.2 + 8.9
23.1
(-3/4) * 2/5
- 3/10
What is the rule for adding integers with different signs?
subtract the integers and keep the sign of the stronger number
-5 + (-2) - 16
-23
4 - 3.9
0.1
2/5 * 8/10
8/25
Describe how you would add (-2) + (-9) on the number line
Start at 0 and move 2 spaces to the left and 9 more spaces to the left and land at -11
(-4) - (-10) + (-1)
(-2.4) + (-19.8)
(-22.2)
2/5 * 5
2 or 2/1
Describe how you would add (-10) + 4 on the number line
Start at 0 and move 10 spaces to the left and 4 spaces to the right and land on (-6)
18 - (-9) + (-3)
24
8.02 + (-12.8)
6/8 * (-4)
(-3)
What is (-4) + 1.5? Describe how you would solve this with a number line and include the answer
Start at 0 and move 4 spaces left and 1.5 move spaces right. Your answer will be (-2.5)
4 - (-8 )+ 10
22