Subtraction

Subtraction is ...

... taking one number away from another.

		Start with 5 apples, then subtract 2, we are left with 3 apples.
This can be written: 5 − 2 = 3 Subtraction Table You can also "look up" answers for simple subtraction using this table: 0 1 2 3 4 5 6 7 8 9 10 11 12 0 0 1 1 0 2 2 1 0 3 3 2 1 0 4 4 3 2 1 0 5 5 4 3 2 1 0 6 6 5 4 3 2 1 0 7 7 6 5 4 3 2 1 0 8 8 7 6 5 4 3 2 1 0 9 9 8 7 6 5 4 3 2 1 0 10 10 9 8 7 6 5 4 3 2 1 0 11 11 10 9 8 7 6 5 4 3 2 1 0 12 12 11 10 9 8 7 6 5 4 3 2 1 0 Example: Find 8 − 5 find the row starting with "8" move along till you are under the column "5" and there is the number "3", so 8 − 5 = 3 Names Other names used in subtraction are Minus, Less, Difference, Decrease, Take Away, Deduct. The names of the numbers in a subtraction fact are: Minuend − Subtrahend = Difference Minuend: The number that is to be subtracted from. Subtrahend: The number that is to be subtracted. Difference: The result of subtracting one number from another. Subtracting Decimals Subtracting decimals is easy when you keep your work neat To subtract decimals, follow these steps: Write down the two numbers, one under the other, with the decimal points lined up. Add zeros so the numbers have the same length Then subtract normally, remembering to put the decimal point in the answer Example: Subtract 0.03 from 1.1 Line the decimals up:     1.1     − 0.03          "Pad" with zeros:     1.10     − 0.03         Subtract:     1.10     − 0.03       1.07 Answer: 1.07 That was just like 110 − 3 = 107, but with the decimal point in a different position Example: Calculate 7.005-0.55 Line the decimals up:     7.005     − 0.55         "Pad" with zeros:     7.005     − 0.550         Subtract:     7.005     − 0.550       6.455 Answer: 6.455 And that was just like 7005 − 550 = 6455