Multiplying 2 Digit Numbers Fast

The usual steps that we in multiplying 2 digit numbers is to multiply vertically as shown in the first figure. We first use the digits ones digit of the multiplicand (12) and distribute to the ones and tens digit of the multiplier (34) shown in Step 1 and Step 2 and write the products. Then, we multiply the tens digit of the multiplicand to the ones and tens digit of the multiplier (Steps 3 and 4). Finally, we add the products to get the final answer.

multplying 2 digit numbers

As you can see, this method requires 5 steps. The discussion below is about an alternative method. Continue reading

Mind Reading Trick 2: The Answer is 4

This is the second mind reading trick in this blog. The first one was titled “The Answer is 3!

The Mind Reading Trick

Step 1: Think of a number.

For example, we think of 8.

Step 2: Multiply it by 3.

Now, 8 multiplied by 3 equals 24.

Step 3: Add 12.

12 + 24 = 36

Step 4: Divide by 3.

36/3 = 12

Step 5: Subtract the original number. The answer is 4.

12 – 8 = 4.

Note that whatever number you chose in Step 1, the final answer after step 5 will always be 4. If you don’t believe me try other numbers. 🙂 Continue reading

Mental Math Shortcut on Multiplying by 5

Mental math shortcut is one of the topics that we will be discussing in this blog. After discussing multiplication by 11 and squaring numbers ending in 5, let us discuss about the shortcut of multiplying by 5.

The Mental Math Calculation

Example 1: How do you multiply 28 × 5?

Instead of multiplying 28 by 5,

(1) Multiply 28 by 10: 28 × 10 = 280 

(2) Divide the product in (1) by 2: 280  ÷ 2 = 140

Example 2: 65 × 5

(1) Multiply 28 by 10: 65× 10 = 650

(2) Divide the product in (1) by 2: 650 ÷ 2 = 325 Continue reading

Math Mind Reading Trick: The Answer is 3!

If you look over the internet, there you can find so many mind reading tricks. In this post, we are going to learn our first mind reading trick. This mind reading trick is easy to learn because it uses only numbers 1 – 10 and it has very few steps. It can be used by kids and youngsters.

The 3 Math Mind Reading Trick

Try doing the trick first and see if it works.

1.) Let your friend choose a number between 1-10.

2.) Tell him to multiply it by 2.

3.) Tell him to multiply the answer by 5.

4.) Tell him to divide the product by the original number (the one he chose in Step 1) and remember the quotient.

5.) Tell him to subtract 7 from the quotient.  Continue reading