Solving Equations

CELEBRATION OF

KNOWLEDGE REVIEW

What is the definition?

Give an example.

ADDITION PROPERTY OF EQUALITY

A pet store has 45 mice. The number of mice is 22 more than the number of cats. Which equation can be solved to find the number of cats c?

A. 22c = 45 C. c + 22 = 45B. 45c = 22 D. c – 22 = 45

What is this?

A MATHEMATIC

AL SENTENCE SHOWING

TWO EXPRESSIONS

ARE EQUAL

What do we call

operations that undo

each other?

Tulia bought 9 new golf balls. If she now has a total of 22 golf balls, how many did she start with? Write an equation and solve to find how many she started with.

j + 5 = 12 9 + w = 14

7.8x = 23.4

WRITE A SUBTRACTION EQUATION

WITH A SOLUTION OF

14

Chad earned $30 for raking leaves. He has also earned money by doing chores. Altogether, he has earned $120. How much did he earn doing chores?

What is this saying?

The height reached by Amal’s rocket was one fourth the height reached by Min’s rocket. Amal’s rocket reached a height of 15 meters. Write a division equation could be used to find the height reached by Min’s rocket?

k – 25 = 99

f – 32 = 13

Samantha brought a bucket of shells home from the beach. She gave 12 shells to her brother. If she now has 47 shells, how manyshells did she bring home from the beach?Write an equation and solve.

ANDREW’S CAT WEIGHS 10.4 POUNDS. THIS IS 25.9 POUNDS LESS THAN THE WEIGHT OF HIS DOG. WRITE AND SOLVE A SUBTRACTION EQUATION TO FIND THE WEIGHT OF ANDREW’S DOG.

= 9.5

= .2

Four friends bought tickets to the school play. If it cost them a total of $28, which equation could be used to find how much each friend paid?

A. X 4= 28 C. x + 4 = 28B. 28 - x = 4 D. 4x = 28

WRITE A MULTIPLICATIO

N EQUATION WITH A

SOLUTION OF 5

Tina noticed that she had taken notes on 25 pages of her notebook. Ninety-five pages were still blank. Write and solve a subtraction equation to find the total number of pages in the notebook.

.8H = 48

7.3p = 29.2

The difference between the high and low temperatures one day was 26°F. The low was 64°F. Write and solve a subtraction equation to find the high temperature.

Mallory needs to go to the airport. It takes her 120 minutes to get there by car. This is 3 times the time it takes by train. Write and solve a multiplication equation to find how long it takes Mallory to get to the airport by train.

2 + p = 6

3 3/4

Jackie and Chelsey have $842.90 together. If Chelsey has $345.23, how much does Jackie have? Write and solve an addition equation to find how much money belongs to Jackie?

A store is selling blank CDs in packages of 30 for $6.00. Write and solve a multiplication equation to find the cost of one blank cd.

Solve with partner

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wit

h y

ou

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art

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ELLIE IS BAKING LASAGNA AND THE

PREP TIME IS 12 MINUTES, WHICH IS

ONE FOURTH OF THE BAKING TIME. WRITE

AND SOLVE A DIVISION EQUATION

TO FIND THE BAKING TIME.