Fill in the missing digits

B.3 Addition: Fill In The Missing Digits by Delta publications

keynotes :

🎇Understanding the Problem

Missing Digit in the Answer: In these problems, part of the final answer is missing, and students need to determine the correct digit.

  • Example: 58+34=__2
  • Example: 7__−25=58
🎪 Recognizing Place Value

Importance of Place Value: Understand that the missing digit’s place value (units, tens, hundreds) affects the entire calculation.

  • Units Place: 48+13=__1
  • Tens Place: 3__+26=54
🎁Steps to Solve the Problem

Analyze the Given Digits:

Focus on the digits you know to deduce the missing digit. Start from the right (units place) and move left (tens, hundreds, etc.).

Perform the Operation:

Use the operation (addition, subtraction, multiplication, or division) to calculate what the answer should be, then figure out the missing digit.

  • Addition Example: 48+13=__1

Calculate 48+13=61, so the missing digit in the answer is 6.

  • Subtraction Example: 7__−25=58

Estimate: Start with 70 or 71 and subtract 25 to see which gives 58.

Check for Carrying or Borrowing:

In addition and subtraction, check if carrying (in addition) or borrowing (in subtraction) is necessary. This can help determine the correct digit.

  • Example with Borrowing: 9__−37=54

Subtract 37 from a number like 90 or 91 to see what makes 54.

Use Logical Reasoning:

Sometimes, multiple possibilities exist for the missing digit. Use logical reasoning and the context of the problem to determine the correct digit.

🎭 Practice with Examples

Addition:

  • 36+4__=7__

Calculate the sum step-by-step, ensuring the tens place is correct.

Subtraction:

  • 8__−46=3__

Subtract different numbers to match the result.

Learn with an example

🔥Type the missing digit:

  • Start on the right. Subtract the ones column, remembering to carry over. Look at the tens column. You want to find the result of 15 minus 8. 15 − 8 = 7. The missing number is 7. Remember to carry over the hundreds.

🔥Type the missing digit:

  • Start on the right. Subtract the ones column, remembering to carry over. Look at the tens column. You want to find a number that, when subtracted from 3, gives a difference of 1. 3 − 2 = 1. The missing number is 2.

🔥Type the missing digit:

  • Start on the right. Look at the ones column. You want to find a number that, when 4 is subtracted from it, gives a difference of 5. 9 − 4 = 5. The missing number is 9.

Let’s practice!