Welcome to Mathnasium’s Math Tricks series. Our previous Math Tricks have looked at strategies for finding half of odd numbers whose tens* *digits are *even*. Today we are focusing on a strategy to find the half of any odd number, such as **99**.

To find half of **999**, we decompose the whole into its parts and find half of each part. Remember that to find *half* of nine hundred ninety-nine means to find “Two parts the same,” “Halfway between,” or, “What number plus itself is equal to nine hundred ninety-nine?”.

Step 1: Nine hundred ninety-nine decomposed is nine *hundreds*, nine *tens*, and nine *ones*.

Step 2: Half of nine hundred ninety-nine is equal to half of ** 900** + half of

Step 3: From our Math Trick we know half of nine is** ***four-and-a-half*, and half of ninety is *forty-five *(not *forty-and-a-half*).

Step 4: Since we know half of nine is four-and-a-half, we automatically know that half of nine hundred (or nine *hundreds*), is *four-and-a-half hundreds*. So, half of nine hundred is *four hundred fifty*.

Step 5: Finally, half of nine hundred ninety-nine is equal to ** 450+45+412=49912**. We can check that

Now you are ready to find half of any odd number. Click here for more practice problems!

If you missed our Math Tricks video on the Half of Odd Numbers (Part 2), check it out on our social media channels. Until next time!

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