Math Tricks and Patterns in Grids

The video tutorial demonstrates a simple math trick using a calendar. By selecting a 3x3 grid of numbers, the sum of these numbers can be calculated by multiplying the middle number by nine. The video provides two examples to illustrate this trick and explains the underlying pattern of even pairs that make the trick work. The tutorial concludes by confirming the trick's validity across different grids.

What is the main tool used in the math trick demonstrated in the video?

• A calendar

• A calculator

• A protractor

• A ruler

In the first 3x3 grid example, what is the middle number?

• 11

• 12

• 13

• 10

What is the result of multiplying the middle number by 9 in the first grid?

• 81

• 90

• 99

• 108

How many numbers are added together in the 3x3 grid?

• 12

• 6

• 8

• 9

What is the sum of the numbers in the first 3x3 grid?

• 88

• 90

• 99

• 100

What pattern is observed when adding certain numbers in the grid?

• They all sum to 20

• They all sum to 22

• They all sum to 24

• They all sum to 26

What is the relationship between the sum of the grid and the middle number?

• Sum is nine times the middle number

• Sum is half the middle number

• Sum is triple the middle number

• Sum is double the middle number

In the second 3x3 grid example, what is the middle number?

• 12

• 11

• 9

• 10

What is the sum of the numbers in the second 3x3 grid?

• 90

• 85

• 80

• 95

What is the result of multiplying the middle number by 9 in the second grid?

• 81

• 90

• 99

• 108