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A six figure grid co-ordinate system is the standard method for maps. This system is used in the Global Positioning System.
To solve 6 x 22 using the grid method, you first break down 22 into its components: 20 and 2. Then, create a grid with one row for 6 and columns for 20 and 2. Multiply: 6 x 20 equals 120, and 6 x 2 equals 12. Finally, add the two products together: 120 + 12 equals 132, so 6 x 22 equals 132.
One method for finding prime numbers is called the "Sieve of Eratosthenes" because it basically "sifts" through the numbers looking for numbers that are not not prime.
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Count the number of squares across the top of the grid, the count the number of squares down the side of the grid. Then multiply these two numbers If you have a grid of 100 squares by 60 squares then the number of squares in the grid is 100x60 = 6000