Why does the finger trick for multiplying by 9 work?

Count the number of fingers that are to the right of the folded finger. This is the “ones” component in your answer. For example, if you are solving 9 x 6, you will see that you have four fingers to the right of the folded finger. This means that the ones digit in your answer will be 4.

What is the nines finger trick?

Step 1: Hold up all 10 of your fingers. Imagine they’re numbered 1 through 10, as you see in the picture. Step 2: Since you’re multiplying 9 x 7, you fold down the seventh finger, like this. Step 3: Count the number of fingers to the left of the folded finger (6).

What is the 9 trick in multiplication?

Count all the fingers after the one that’s held down – 6. This is the last number of your answer. To find the answer to another 9 × table question, just hold down the correct finger and count the fingers on either side. So you hold down your 5th finger for 5 × 9, your 7th finger for 7 × 9, and so on.

How does the nines trick work?

Here’s how it works: Hold up both hands in front of you with your palms facing away, and pick an equation to solve that involves multiplying by nine. For example, 9 x 4. Starting from the pinky on your left hand, count up to the number that you are multiplying by (in this case, 4).

Do you bend your fingers before doing the multiplication trick?

Before using the trick, assign a number to each one of your fingers, in order from 6 to 10 on each hand. On your left hand, bend the finger with the first factor, or number in the multiplication problem, and then bend all the fingers with smaller numbers on your left hand.

Which is the magic number in the multiplication trick?

The magic to this trick is that the number given to the finger that she folds down x 9 is equal to the number of fingers to the left of the bent finger (in the tens place) and the fingers to the right (in the ones place.)

How to multiply two numbers with your fingers?

This video teaches how you can use your hands to multiply two numbers between 6 and 10 using your fingers. Here’s the reason the method works:

How to do multiplication with your left hand?

On your left hand, bend the finger with the first factor, or number in the multiplication problem, and then bend all the fingers with smaller numbers on your left hand. On the right hand, bend the finger with the second factor in the problem, followed by all of the smaller numbers on your right hand.