Subtraction: fill in the missing digits
key notes :
Understanding Subtraction:
- Subtraction is finding the difference between two numbers. It involves taking one number away from another.
- Example: In 8 – 3 = 5, 3 is subtracted from 8 to get 5.
Missing Digits in Subtraction:
- Problems may present a subtraction equation where one or more digits are missing. The goal is to fill in these missing digits to complete the equation.
Place Value:
- Understanding place value (units, tens, hundreds) is essential for solving these problems. Missing digits can be in any place value position.
Using Strategies:
- Subtraction Facts: Use known subtraction facts to determine the missing digits.
- Number Lines: Use number lines to visualize the subtraction process.
- Work Backwards: Sometimes working backward from the result can help find the missing digits.
Learn with an example
Type the missing digit:
88 – 55 = __3
Start on the right. Subtract the ones column. Look at the tens column. You want to find the result of 8 minus 5. 8 − 5 = 3. The missing number is 3.
88 – 55 = 33
Type the missing digit:
91 – 24 = __ 7
Start on the right. Subtract the ones column, remembering to carry over. Look at the tens column. You want to find the result of 8 minus 2. 8 − 2 = 6. The missing number is 6.
91 – 24 = 67
Type the missing digit:
83 – 6 __ = 14
Start on the right. Look at the ones column. You want to find a number that, when subtracted from 13, gives a difference of 4. 13 − 9 = 4. The missing number is 9. Remember to carry over the tens.
83 – 69 = 14
Let’s practice!
