Difference between 30 and 18

Vertically align numbers with Larger Number on top:
3 0
1 8

Subtract using place value:

Tens Ones
2 10
30 3 0
18 1 8
Difference 1 2
Column traversal from right to left
Ones column:
  • Since 0 is less than 8, we have to borrow 1 from the Tens column
  • As a result, 0 becomes 10, and 10 − 8 = 2
  • The 3 in the Tens column becomes 2

Tens column:

  • 2 − 1 = 1
2 10
3 0
1 8
1 2
Therefore, the Difference between 30 and 18 is 12

Check computation by comparing Larger Number and the Sum of Smaller Number and Difference:

1
1 8
1 2
3 0

Sum of Smaller Number and Difference = 30
Sum of Smaller Number and Difference = Larger Number (30 = 30) ✓

The solution above and other related solutions were provided by the Difference Between Two Numbers Application.

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