# 5 Math Tips and Tricks

**1. Multiplying by 6.**

If you multiply 6 by an even number, the answer will end with the same digit. The number in the ten’s place will be half of the number in the one’s place

**Example: **6 x 6 = 36

**2. Memorizing Pi.**

To remember the first seven digits of pi, count the number of letters in each word of the sentence:

“How I wish I could calculate pi.”

This becomes 3.141592.

**3. Finger Multiplication Tables.**

Everyone knows you can count on your fingers. Did you realize you can use them for multiplication? A simple math trick to do the “9” multiplication table is to place both hands in front of you with fingers and thumbs extended. To multiply 9 by a number, fold down that number finger, counting from the left.

**Example1**: To multiply 9 by 5, fold down the fifth finger from the left. Count fingers on either side of the “fold” to get the answer. In this case, the answer is 45.

**Example2: **To multiply 9 times 6, fold down the sixth finger, giving an answer of 54.

**4. Multiplying 5 times any number.**

When multiplying the number 5 by an even number, there is a quick way to find the answer.

**Example1: **For example, 5 x 4 =

Step 1: Take the number being multiplied by 5 and cut it in half, this makes the number 4 become the number 2.

Step 2: Add a zero to the number to find the answer. In this case, the answer is 20.

5 x 4 = 20

**Example2: **When multiplying an odd number times 5, the formula is a bit different.

For instance, consider 5 x 3.

Step 1: Subtract one from the number being multiplied by 5, in this instance the number 3 becomes the number 2.

Step 2: Now halve the number 2, which makes it the number 1. Make 5 the last digit. The number produced is 15, which is the answer.

5 x 3 = 15.

**5. Tough multiplication.**

When multiplying large numbers, if one of the numbers is even, divide the first number in half, and then double the second number. This method will solve the problem quickly.

**Example: **For instance, consider 20 x 120

Step 1: Divide the 20 by 2, which equals 10. Double 120, which equals 240.

Then multiply your two answers together.

10 x 240 = 2400

The answer to 20 x 120 is 2,400.

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