Watch the video on YouTube here: https://youtu.be/ZZVHbNkUMOI
In double-digit addition, we write the numbers according to their place values of ones and tens. Then we add the numbers starting from the one's column and move ahead to the tens column. Numbers in the one's column: 1 + 7 = 8. Numbers in the tens column: 5 + 4 = 9.
The expression for a two-digit number is 10a+b. To solve the first special number you create an algebraic equation. You need to add the sum of the two digits to the product of the two digits to get the original number. So now you know the units part of the two-digit number will always be 9.
The addition formula is the statement that shows an addition fact and is expressed as addend + addend = sum.
A special two-digit number is a number such that when the sum of the digits of the number is added to the product of its digits, the result is equal to the original two-digit number.
This means there are 100 possible combinations of two numbers using digits 0 through 9 if a digit can be repeated. If we cannot use a number twice, which means we do not return that outcome to the pool after it is selected, there is one less option for the second number.
Completing the square: x2+bx+c=(x+b2)2−b24+c.
Quadratic formula: the roots of ax2+bx+c are −b±√b2−4ac2a.
Circle: circumference=2πr, area=πr2.
Sphere: vol=4πr3/3, surface area=4πr2.
Cylinder: vol=πr2h, lateral area=2πrh, total surface area=2πrh+2πr2.
What is famous math formula?
E=mc^2. For our first, we'll take perhaps the most famous equation of all. Albert Einstein's 1905 equation relating mass and energy is both elegant and superficially counterintuitive. It says that energy is equal to the mass of an object in its rest frame multiplied by the speed of light squared.
The digit sum - add the digits of the representation of a number in a given base. For example, considering 84001 in base 10 the digit sum would be 8 + 4 + 0 + 0 + 1 = 13. The digital root - repeatedly apply the digit sum operation to the representation of a number in a given base until the outcome is a single digit.
The simplest case is when two numbers are not too far apart and their difference is even, for example, let one be 24 and the other 28. Find their average: (24 + 28)/2 = 26 and a half the difference (28 - 24)/2 = 2.
The greatest 2-digit number, using only one digit is 99. (99 is the greatest two-digit number too). The greatest 2-digit number, using all different digits is 98. There are only two place values in two-digit numbers, tens and ones.
I would recommend introducing two-digit addition by using base ten blocks. This makes the concept more concrete because it's very easy for children to visually see the process of putting together the tens and ones. Plus, regrouping is so much easier to understand when kids see it in action this way.
When we add one unit to the greatest one-digit number we get the smallest two-digit number. The smallest two-digit number is 10 and the greatest is 99. Now imagine an auditorium, filled with hundreds of people. We definitely cannot count these many people, just by using our fingertips.
A number is a Krishnamurty number if the sum of the factorial of each digit is the same as the number. For example, if a number is 145, then sum = 1!
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