One Step Equations with Positive Rational Numbers

WRITE AN EQUATION
After paying $5.12 for a salad, Norachai has $27.10. How much money did he have before buying the salad?

• 27.10+5.12=x

• 27.10-5.12=x

• x-5.12=27.10

• 5.12+x=27.10

Tags

CCSS.HSA.CED.A.3

If one roll of masking tape costs $1.15, how many rolls can Emma buy  with $5.75?

• 1.15(5.75) = x

• 5.75x = 1.15

• 1.15x = 5.75

• x = 1.15/ 5.75

Tags

CCSS.6.EE.B.7

Why do you divide by 5 on both sides?

• To undo division, you must multiply.

• To balance the equation, you must divide by 5 on both sides.

• To undo multiplication, you must divide.

• To balance the equation, you must multiply by 5 on both sides.

Tags

CCSS.HSA.REI.A.1

Why do you multiply by 8 on both sides?

• To undo division, you must multiply.

• To balance the equation, you must divide by 8 on both sides.

• To undo multiplication, you must divide.

• To balance the equation, you must multiply by 8 on both sides.

Tags

CCSS.HSA.REI.A.1

• subtract both sides by 2

• add both sides by 2

• multiply both sides by 2
  

• divide both sides by 2

Tags

CCSS.6.EE.B.7

• subtract both sides by 9

• add both sides by 9

• multiply both sides by 9

• divide both sides by 9

Tags

CCSS.6.EE.B.7

Why do you multiply by 8?

• To undo division, you must multiply.

• To balance the equation, you must divide by 8 on both sides.

• To undo multiplication, you must divide.

• To balance the equation, you must multiply by 8 on both sides.

Tags

CCSS.HSA.REI.A.1

8n + 7 = 31

• 3

• 16

• 5

• -3

Tags

CCSS.7.EE.B.4A

-10 = 10 (k - 9)

• 8

• 100

• 3

• 90

Tags

CCSS.7.EE.B.4A