How do you add using a 100-number chart?


Quick Answer

In order to add using a 100-number chart, start on the first given number and move a finger or place holder along the chart as many spaces as the number being added to end on the correct sum. Because addition is commutative, it does not matter which number is used for the starting position or what number is used to move forward on the chart.

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Full Answer

A 100-number chart is a very good visual way to teach simple mathematical operations to young students. The chart usually consists of 10 rows and 10 columns, with each square having a single number in it from 1 to 100. The chart allows students to easily perform simple addition and subtraction problems, and it also helps them to understand the relationship between numbers.

  • Using the chart to add two numbers
  • Put a finger or a place holder, such as a coin, on the square that indicates the first number in the problem. Move the finger or coin along the chart in the positive direction as many spaces as the second number in the original addition problem. The number that the coin or finger lands on is the sum of the two numbers.

  • Adding more than two numbers.
  • Start with a finger on the first number. Then, move in the positive direction as many spaces as the next number in the problem. Once finished, move the finger again as many spaces as the third number in the problem. Continue this process to find the sum of three or more numbers.

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