Subtract a one-digit number from a two-digit number up to 18
key notes :
Understanding Two-Digit Numbers:
- Explain that two-digit numbers range from 10 to 99.
- Emphasize that the first digit represents the tens place and the second digit represents the ones place.
Understanding One-Digit Numbers:
- One-digit numbers are from 0 to 9.
- Reinforce that these numbers will be subtracted from the two-digit numbers.
Subtraction Concept:
- Subtraction is finding the difference between numbers.
- Introduce the subtraction symbol (−) and explain how to read a subtraction equation (e.g., 15 – 3).
Steps for Subtracting:
- Identify the two-digit number and the one-digit number.
- Start from the ones place of the two-digit number.
- If the one-digit number is greater than the ones digit, borrow from the tens place (for example, in 14 – 8, borrow 1 from the 1 to make it 10 in the ones place).
Examples:
- Provide examples such as:
- 12 – 4 = 8
- 15 – 7 = 8
- 18 – 5 = 13
- Solve each example step by step, explaining the process.
Learn with an example
Subtract.
18 – 4 =
solution
You can count back to subtract. Start from 18 and count back 4:
18, 17, 16, 15, 14
18 – 4 = 14
The difference is 14.
Subtract.
10 – 4 =
You can count back to subtract. Start from 10 and count back 4:
10, 9, 8, 7, 6
10 – 4 = 6
The difference is 6.
Subtract.
16 – 5=
You can count back to subtract. Start from 16 and count back 5:
16, 15, 14, 13, 12, 11
16 – 5 = 11
The difference is 11.
Let’s practice!🖊️
