Can You Do 18X19 In 2 Seconds?

Can You Do 18X19 In 2 Seconds?

Fast mental math tricks that help you do well in any math tests. Math Genius ? Good Job ? A good foundation ?

始める 共有
Can You Do 18X19 In 2 Seconds?
Let us start with an easy one. Calculate 12x13 without a paper, pencil, or a calculator in 2 seconds.
Take the first number 12, add the ones of the second number -- 3, you get 12 + 3 = 15. Add a "0" to it, you get 150.
Then multiple the ones of the first and second number, you get 2x3 = 6.
Then add 150 and 6, you get 156.
Now answer this question: 11x12 = ?
質問 1 out of 5
123 132 133
Can You Do 18X19 In 2 Seconds?
Let us do another one: 13x15 = ?
Take the first number 13, add the ones from the second number -- 5, you get 13 + 5 = 18. Add a "0" to it, you get 180.
Then multiple the ones of the first and second number, you get 3x5 = 15.
then add 180 and 15, you got 195.
Now answer this question: 12x14 = ?
質問 2 out of 5
166 168 186
Can You Do 18X19 In 2 Seconds?
Let us do a tough one: 17x14 = ?
Take the first number 17, add the ones from the second number -- 4, you get 17 + 4 = 21. Add a "0" to it, you get 210.
Then multiple the ones of the first and second number, you get 7x4 = 28.
Finally add 210 and 28, you get 238.
Now do this: 16x15 = ?
質問 3 out of 5
191 240 243
Can You Do 18X19 In 2 Seconds?
Let us do another one: 16x16 = ?
Take the first number 16, add the ones from the second number -- 6, you get 16 + 6 = 22. Add a "0" to it, you get 220.
Then multiple the ones of the first and second number, you get 6x6 = 36.
Then add 220 and 36, you get 256.
How about this: 17x17 = ?
質問 4 out of 5
249 289 319
Can You Do 18X19 In 2 Seconds?
Ready for this: 18x19 = ?
Take the first number 18, add the ones from the second number -- 9, you get 18 + 9 = 27. Add a "0" to it, you get 270.
Then multiple the ones of the first and second number, you get 8x9 = 72.
Just add 270 and 72, you got 342.
Last question: 19x17 =?
質問 5 out of 5
283 323 363
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