To convert Fahrenheit to Celsius, we use the following formula,

** C = 5/9 (F – 32) = 10/18 (F – 32)**

The trick here is to recognize that 5/9 is the same as 10/18. Hence after deducting 32, we add a zero (multiply by 10) to the result and successively dividing by 2 and 9 (MSC 11 – Dividing by 9) to effectively divide by 18.

- Step 1. Subtract 32
- Step 2. Multiply by 10
- Step 3. Divide by 2
- Step 4. Divide by 9

Let us solve look at some examples.

Example 1: **100 **^{o}F = 37.8 ^{o}C

- Step 1. Subtract 32: 100 – 32 = 68
- Step 2. Multiply by 10: 68 x 10 = 680
- Step 3. Divide by 2: 680 ÷ 2 = 340
- Step 4. Divide by 9: 340 ÷ 9 = 37 r. 7 = 37.7… =
**37.8**

Example 2: **145**^{o}F = 62.8^{o}C

- Step 1. Subtract 32: 145 – 32 = 113
- Step 2. Multiply by 10: 113 x 10 = 1130
- Step 3. Divide by 2: 1130 ÷ 2 = 565
- Step 4. Divide by 9: 565 ÷ 9 = 62 r. 7 = 62.7… =
**62.8**

Easy and simple!

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