Test: Subtraction - Class 2 MCQ

To check if a subtraction is correct, you add the difference to the smaller number. If the sum equals the larger number, the subtraction is confirmed as correct.

The first step is to subtract the ones place digits (7 - 5 = 2). This is crucial because it lays the foundation for the overall subtraction process before addressing the tens place.

One effective method of mental subtraction is to break the number into tens and ones, allowing for simpler calculations. For example, breaking 45 into 40 and 5 can simplify the subtraction process.

The order of subtraction is important; you cannot subtract a larger number from a smaller number because it results in a negative value, which is not permissible in basic arithmetic for this context.

If the digit in the ones place is smaller than the digit to be subtracted, you need to borrow from the next higher place value, which allows for a proper subtraction without resulting in a negative number.

The correct operation is 58 - 39, which allows you to find how many fewer 39 is than 58. The result is 19, meaning there are 19 girls if 39 boys are part of a total of 58 students.

When you subtract 40 from 73 (which gives 33), you need to adjust by adding 2 because you initially subtracted 2 more than needed (40 instead of 38). Thus, 33 + 2 = 35 is the correct answer.

Subtracting a number from itself always results in zero (e.g., 5 - 5 = 0). This property is fundamental in arithmetic and helps in understanding balance in equations.

Words like "take away" indicate that subtraction should be used to determine the difference. Recognizing these keywords is essential for solving word problems accurately.

To find the number of girls, you subtract the number of boys from the total students: 58 - 39 = 19. This shows how subtraction helps determine remaining quantities.

Subtracting 0 from any number gives the same number because it signifies that no value is being taken away. For example, 5 - 0 equals 5, illustrating that the quantity remains unchanged.

To find the difference, subtract: 82 - 27 = 55. This subtraction shows how understanding place values helps in calculating the differences accurately.

Every addition fact has two corresponding subtraction facts. For example, if 5 + 3 = 8, then 8 - 5 = 3 and 8 - 3 = 5. This relationship highlights the interconnectedness of addition and subtraction.

The first step is to subtract the ones place digits (4 - 9). Since 4 is less than 9, you will need to borrow from the tens place, turning it into a proper subtraction.

Borrowing in subtraction refers to taking a value from a higher place value to facilitate the subtraction of a larger digit in a lower place value. This ensures that the subtraction can be performed correctly.

When borrowing for 63 - 25, the 6 in the tens place becomes 5, and the 3 in the ones place becomes 13. This allows for the proper subtraction of 13 - 5 = 8.

To determine what to add to 88 to reach 91, you calculate: 91 - 88 = 3. This method is a quick way to find differences, emphasizing the relationship between addition and subtraction.

To find the missing digit, you can think: 5 - 2 = 3. Therefore, the missing digit is 2, which shows how subtraction can be used to find unknown values.

The correct subtraction fact is 10 - 3 = 7, which leads to the addition fact 3 + 7 = 10. This illustrates the concept that subtraction and addition are inverse operations, reinforcing the understanding of number relationships.

Using method 1, you break 45 into 40 and 5. First, subtract 76 - 40 = 36, then subtract 36 - 5 = 31. Thus, the final answer is 31.