Lesson: Addition and Subtraction Equations

Fares went to the supermarket and bought a bar of chocolate for $3.03. When he returned home, he found he had $4.61 left. Write an equation to find how much money Fares had before going to the supermarket, and then solve it.

Sherif’s mother gave him colouring pencils for his birthday. He lost 43 of them at the park. If he has 40 left, write and solve an equation to find how many colouring pencils Sherif’s mother gave him.

Fares had 274 LE. After he bought a notebook for x LE, he had 242 LE left. How much was the notebook?

If the point lies on the Y-axis, find the value of .

Given that , find and .

Find the rational number that when subtracted from its additive inverse gives .

Find the solution set of in .

The diagram can be used to solve the equation . By finding the missing numbers in the diagram, work out the value of .

Yasmine has 12 cows in her farm, which is 5 cows fewer than her neighbor’s farm. Write a subtraction equation to determine the number of cows that her neighbor has, and then solve it.

If I was 9 years old in 1998, how old was I in 2009?

Mariam is 6 years older than her sister, and her sister is 23 years old. Write an equation which describes this situation using to represent Mariam’s age.

Ramy scored 70 points on a test. This was 35 points less than Sally’s score. Write an equation to represent this situation, and then determine Sally’s score.

A school has 59 students. 51 of them have paid to go on a school trip. How many students are not going on the trip?

Samar walked 15 yards to the supermarket and then went back 12 yards, in the opposite direction, to the bakery. Write a subtraction equation to find the total number of yards she walked, and then solve it.

During her dive, a diver stopped at a certain depth for an equipment check. Then she descended 42 feet until she reached a depth of 85 feet below sea level. Write a subtraction equation that can be used to find the diver’s position when she did an equipment check, and then solve it.

Dalia was paragliding. After losing 55 feet in altitude, she was gliding at 320 feet. Write and solve an equation to find her altitude at the moment of takeoff.

A diver began his ascent to the surface. He ascended 20 metres to his next decompression stop and must ascend another 32 metres to return to the surface. Write and solve a subtraction equation to find the diver’s original depth before he started ascending.

A diver began his ascent to the surface. He ascended 23 metres to his next decompression stop and must ascend another 69 metres to return to the surface. Write and solve a subtraction equation to find the diver’s original depth before he started ascending.

The value of in the equation is an integer greater than 4 and less than 9. Determine all the possible values of .