Episode 17 - Under Quarantine
from Under Quarantine Hosted by Under Quarantine
Quote from Dr.Dan MATH STUFF “11 x 1 = 11, 11 x 2 is 22, 11 x 7 is 77 and so on... - for double digit numbers, there is a shortcut to make it easy. - the first number of the answer is the first digit of the number you are multiplying by - the last number of the answer is the second digit of the number you are multiplying by - the middle number is the sum of the numbers you are multiplying by - makes sense? I think an example will be helpful... - let's stay 11 x 14 - the middle number is (1 + 4) or 5 - the first number of the answer will be 1 - the last number of the answer will be 4 - so 11 x 14 = 154 - one more example: 11 x 42 - the middle number of the answer will be 6 - the first number of the answer will be 4 - the last number of the answer will be 2 - so 11 x 42 = 462 - it gets a little trickier when the the two numbers sum to be greater than 9, but it's just one additional step - say 11 x 67 - 6 + 7 = 13, so the middle number will be 3 but you have to take the 1 and add it to the first number (this is like "carrying over" in normal additional) - so the first number will be 6 + 1 = 7 - the last number will be 7 - so 11 x 67 = 737”
Embed this episode
No transcript yet.