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In this lesson, we will learn how to write and solve one-step subtraction equations in questions including word problems.

Q1:

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.

Q2:

Sherifβs 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 Sherifβs mother gave him.

Q3:

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

Q4:

The diagram can be used to solve the equation π β 2 3 = 9 6 .

What is the missing number in the diagram?

What is the value of π ?

Q5:

If the point ( π β 1 , β 4 ) lies on the Y-axis, find the value of π .

Q6:

Given that { π₯ β 4 , 4 } = { π¦ β 2 , 7 } , find π₯ and π¦ .

Q7:

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

Q8:

The diagram can be used to solve the equation π£ β 1 6 = 3 2 .

What is the value of π£ ?

Q9:

Find the solution set of π₯ β ( β 3 ) = 5 in β .

Q10:

The equation 1 2 β π‘ = 8 can be solved using a tape diagram as shown.

The next step to solve the equation is represented by the given diagram. What is added to 1 2 β π‘ to make 12?

This leads to the following diagram given that 1 2 β π‘ = 8 .

Which of the following calculations is used to find π‘ ?

Q11:

The diagram can be used to solve the equation 2 4 β π£ = 1 7 . By finding the missing numbers in the diagram, work out the value of π£ .

Q12:

The equation π β 6 = 1 8 can be solved using a tape diagram as shown.

The next step to solve the equation is represented by the given diagram. What is the missing number?

This leads to the following diagram given that π β 6 = 1 8 .

Which of the following calculations gives the value of π ?

Q13:

Fares has gone on a diet to lose weight. When he started, he weighed 82 kg. The last time he weighed himself, his weight was 77 kg.

Write an equation for the weight , in kilograms, he has lost so far.

Solve your equation to find out how much weight Andrew has lost.

Q14:

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

Q15:

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

Q16:

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 Mariamβs age.

Q17:

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

Q18:

The diagram can be used to solve the equation π€ β 6 5 = 1 3 .

What is the value of π€ ?

Q19:

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?

Q20:

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.

Q21:

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 diverβs position when she did an equipment check, and then solve it.

Q22:

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.

Q23:

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 diverβs original depth before he started ascending.

Q24:

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 diverβs original depth before he started ascending.

Q25:

The value of π₯ in the equation π₯ + π¦ = β 8 is an integer greater than 4 and less than 9. Determine all the possible values of π¦ .

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