- Add and Subtract Whole Numbers
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- Single Digit Addition
- Addition of 3 or More Single Digit Nnumbers
- Addition of Two 2-digit Numbers Without Carry
- Adding 2-digit Numbers and Single Digit Numbers
- Addition of Two 2-digit Numbers With Carry
- Addition With Carry to the Hundreds Place
- Addition of 2-digit, 3-digit and 4-digit Numbers
- Subtracting a Number From a 2-digit Number
- Subtraction of Two 2-digit Numbers Without Borrowing
- Subtraction of Two 2-digit Numbers With Borrowing
- Subtraction with Multiple Regrouping Steps
- Subtraction and Regrouping With Zeros
- Fact Families for Addition and Subtraction
- Addition or Subtraction of Whole Numbers (Word problems)
- Increasing or Decreasing Pattern from a Table of Values
Subtracting a Number From a 2-digit Number
Subtract the numbers 17 − 8
Solution
Method 1
We subtract the numbers using a number line here. On the number line, start from the larger number 17 and then make 8 jumps to the left to land on 9. This is the difference between 17 and 8.
Method 2
Counting backwards
We represent number 17 with 17 little diamonds. Since 8 is to be subtracted from 17, we strike off 8 diamonds while counting backward. The 9 diamonds that are left, are the result of the subtraction.
17 – 8 = 9
Subtract the numbers 15 − 6
Solution
Method 1
We subtract the numbers using a number line here. On the number line, start from the larger number 15 and then make 6 jumps to the left to land on 9. This is the difference between 15 and 6.
Method 2
Counting backwards
We represent number 15 with 15 little stars. Since 6 is to be subtracted from 15, we strike off 6 stars while counting backward. The 9 stars that are left, are the result of the subtraction.
15 – 6 = 9
