WOLFRAM|DEMONSTRATIONS PROJECT

Visualizing Simple Addition and Multiplication

color

Blue

first number

1

2

3

4

5

6

7

8

9

operation

+

×

second number

1

2

3

4

5

6

7

8

9

repetitions

One of the elements of the National Council of Teachers of Mathematics (NCTM) number and operations standard for grades pre-K-2 is that students be able to "understand the effects of adding...whole numbers...". This Demonstration allows students (and their teachers) to explore whole number addition and multiplication on a hundred board.