One-Step Equations

After paying $4.50 for a sandwich, Charlie has $9.50. How much money did he have before buying the sandwich?

• x - 4.50 = 9.50
• 4.50 - x = 9.50
• 9.50 - 4.50 = x
• 4.50 + x = 9.50

After paying $4.50 for a sandwich, Charlie has $9.50. How much money did he have before buying the sandwich?

17 years ago, Moira was 64 years old. How old is she now?

• m = 64 - 17
• m + 17 = 64
• m - 17 = 64
• 64 - m = 17

17 years ago, Moira was 64 years old. How old is she now?

Cal bought 8 candy bars for $10. How much did each candy bar cost?

• 8b = 10
• 10 - b = 8
• 10b = 8
• b/8 = 10

Cal bought 8 candy bars for $10. How much did each candy bar cost?

Last week, Lee had $45. Over the weekend, he received some money for a great report card. He now has $70. How much money did he receive?

• 45 + m = 70
• 70 + 45 = m
• 70 = m - 45
• 45 - m = 70

Last week, Lee had $45. Over the weekend, he received some money for a great report card. He now has $70. How much money did he receive?

Last month, Archie ran 16.5 miles more than Carlos. Archie ran 21 miles. How many miles did Carlos run?

• 16.5 + 21 = c
• c + 16.5 = 21
• c - 16.5 = 21
• 21 + 16.5 = c

Last month, Archie ran 16.5 miles more than Carlos. Archie ran 21 miles. How many miles did Carlos run?