Grade 4 Quiz - Addition & Subtraction

Grade 4 Quiz - Addition and Subtraction with Inverse Operations

• Instructions: Solve each number sentence. Some problems may require using inverse operations to find the missing number.

• Question 1: 25 + __ = 52

• Question 2: 68 - 23 = __

• Question 3: __ - 14 = 37

• Question 4: 42 + __ = 79

• Question 5: 81 - __= 30

• Question 6: __ + 29 = 94

• Question 7: 15 + 28 – 12 = __

• Question 8: 76 - (45 + 10) = __

• Question 9: What number is 27 more than 38?

• Question 10: If the difference between two numbers is 51 and one number is 74, what is the other number?

• Question 11: Anna has 49 stickers and adds another 19. How many stickers does Anna have now?

• Question 12: Peter has 67 marbles. He loses 28. How many marbles does Peter have left?

Study Notes - Addition and Subtraction with Inverse Operations

Understanding Addition and Subtraction

• Addition is combining two or more numbers to find a total (sum).
• Subtraction is taking one number away from another to find the difference.

Inverse Operations

• Addition and subtraction are inverse operations. This means that one operation "undoes" the other.
• To find a missing addend in an addition sentence, subtract the known addend from the sum.
• To find a missing subtrahend in a subtraction sentence, subtract the difference from the minuend.
• To find a missing minuend, add the subtrahend and the difference.

Example Problems Illustrating Inverse Operations

• Example 1: Find the missing number: 25 + __ = 52

• To find the missing number, subtract 25 from 52: 52 – 25 = 27

• The missing number is 27.

• Example 2: Find the missing number: __ - 14 = 37

• In this subtraction sentence, to find the missing minuend (the first number), add the subtrahend and the difference: 37 + 14=51.

• The missing number is 51.

Two-Digit Numbers

• Work with two-digit numbers in addition and subtraction sentences.
• Practice adding and subtracting using place value.

Word Problems

• Relate addition and subtraction to real-life contexts.
• Solve addition and subtraction word problems by first identifying what is given, and then the question that needs answered.

Solving Multi-Step Problems

• Problems involving more than one step may be needed.
• Break down complex problems into simpler steps that you can solve.
• For example: 76 – (45 + 10). First, calculate the sum inside the parentheses, and then subtract.

Applying Inverse Strategy

• Understand that subtraction undoes addition, and addition undoes subtraction.
• Use these inverse operators to solve for the missing number in a problem.
• Apply the inverse operation to find a missing number in sums and differences.