4- How to multiply 6,7,8 and 9 using your fingers
Turn both your hands so that your palms are facing you. Assign each finger a number starting with the pinkies. So, pinkies represent 6, ring fingers represent 7, middle fingers represent 8, your indexes are 9s, and your thumbs are 10. Now, let’s say we want to calculate 7×8:
- We would touch our left ring finger (for 7) to the middle finger of the right hand (for 8).
- Now, count the touching fingers and all the fingers beneath them. In this case, we have 5 (the touching middle and ring finger, the ring finger from the right hand, and the two pinkies). These bottom numbers represent 10s, so 5 x 10 is 50.
- Now, all the fingers on top of the touching fingers represent 1s, and they need to be multiplied together. In this case, we have 3 top fingers on the left hand (the middle, index, and thumb) and 2 fingers on the right hand (index and thumb). If we multiply them, 3 x 2 is 6.
- Add the product from the top fingers to the product from the bottom fingers (50+6), and you get the answer, 56.
3- How to multiply the number 9 using your fingers
If you need to multiply a small number by 9, then the method is even easier.
Put both your hands up, with your fingers outstretched. The first finger (the left pinky) represents the number 1, the left ring finger represents the number 2, the left middle finger the number 3, and so on, and so on, all the way to 10. Now, let’s say you want to multiply 9 by 3. First, you would bend the third finger downwards (the left middle finger).
Now, count the fingers to the left and right of the bent finger. In this case, we have 2 on the left and 7 on the right. Put them together, and the answer is 27.
2- How to quickly measure the degrees of an angle
You can easily calculate the degrees of an angle by using one hand. First, spread your fingers as much as possible. Next, put your palm down onto the angle you want to measure, with the pinky finger touching the bottom side. This pinky represents o°. Now, just see which finger the angle comes closest to: the angle between the thumb and pinky finger is 90°, between pinky and index is 60°, between pinky and middle is 45°, and between pinky and ring is 30°.
1- How to quickly measure distance
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Source: shareably.co
