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Get in touch with us  # Solve Addition and Subtraction Word Problems Using Equation

## Key Concepts

Solve word problems to add and subtract values using equations

### 1. Find the unknown numbers

• We can use counters to find the missing number.
Example: Find the missing value in 15 – _____ = 8

### 2. True or false equations

• We can verify if a numerical equation is true.
Let us check whether the given equation is true or not.
3 + 6 = 4 + 5

Step 1: Find the value of each side of the equation.

Step 2: Compare the values on both sides of the equation.

Here, LHS = RHS

So, the given equation is true.

### 3. Equations with no operations

• Equations without any mathematical operations can also be true.

Example: Verify if the equation 3 = 3 is true.

Sol: Value at LHS is 3.

Value at RHS is also 3.

So, the equation is true.

### 4. Addition and subtraction using equations

Steve baked 35 muffins. Arthur baked 52 muffins. How many muffins did Steve bake less than Arthur?

Step 1: Make sense

Understand the problem given to find the missing value and place the given values in a table.

Step 2: You can write an addition or subtraction equation to find the missing value.

52 = _____ + 35

or

52 – 35 = ______

Therefore, Arthur made 17 muffins more than Steve.

## Exercise

1. James has 5 books. His mother gifts him 3 more books on his birthday. How many books does James have now?
2. Tony and Chris together bake 15 cakes. If Tony alone baked 8 cakes, how many cakes did Chris bake?
3. Amy has 11 more pencils than Rachel. If Rachel has 6 pencils, how many pencils does Amy has?
4. Neo has 24 toys. He gave 12 toys to his sister. How many toys does he have now?
5. Jen buys 5 sunflower plants and 8 tulip plants. How many plants did Jen buy in total?
6. Christ wants to visit 13 states. He already visited 9 states. How many states does he need to cover more?
7. Tom and Dennis scored 54 runs together in cricket. If Tom scored 28, what was Dennis’s score?
8. Mother gave 4 chocolates to Alex. Later, his grandfather gave 5 chocolates to Alex. How many chocolates does he have in total?
9. Tina had \$37.50. She bought a book for \$9.30 and had lunch for \$12.15. How much money is left with her?

### What we have learned

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