Equations with Rational Numbers

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.

What is the solution of the equation? 
1/3a = 7/9

• 2  1/3

• 1  2/7

• 7/27

• 1/3

Solve the equation:
-2.6 + x = -4.6

• x = 2

• x = -2

• x = 7.2

• x = -7.2

Solve the equation. Check your solution. It's - 7/8

• 24

• ¹⁴⁷/₈ or 18 ³/₈

• 168

• -24

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

Why do you divide by 5?

• 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.

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.

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.

• subtract both sides by 2

• add both sides by 2

• multiply both sides by 2
  

• divide both sides by 2

• subtract both sides by 9

• add both sides by 9

• multiply both sides by 9

• divide both sides by 9