adding and subtracting rational numbers

• $82.09
• $82.61
• $82.85
• $83.37

• $8.73
• $9.27
• $11.27

• 13.1 gallons
• 10.3 gallons
• 6.2 gallons

• $5.10
• $7.40
• $14.90
• $20.10

• -4  3/4
• -1/4
• 1  1/4
• 3  1/4

• +241.68
• +59.02
• -59.02
• -241.68

• 6.125 miles
• 7.125 miles
• 6.875 miles
• 7.875 miles

• -218.75
• -193.85
• 193.85
• 218.75

When adding rational numbers with the same sign, you must:

• Subtract and keep the sign of the biggest number

• Add together and keep the sign

• Keep, change, switch

• Add the opposite

-6.5 + (-0.5) 

• -7
• 7
• 6
• -6