Fill in the missing digits

keynotes :

🎇1. 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

🎪2. 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

🎁3. Steps to Solve the Problem

  1. 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.).
  2. 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.
  3. 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.
  4. 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.

🎭4. 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!