What is a hundreds table and why should I care?
1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14.... (a partial number line)

Visualizing the base 10 number line as a table can help learners internalize the relationship between numbers in equations which use simple arithmetic such as addition and subtraction. This approach can aid in learning to add and subtract larger numbers more quickly using a skip counting technique involving the 10s and 1s columns when a number is large enough to warrant it.

A simple example:
Consider the equation: 12 + 27 = ?. Using counting by ones starting at 12 we eventually arrive at the answer (39) using brute force. However, by skip counting by 10 we reduce the number of incremental iterations by 18, arriving at the answer more quickly. The technique can be taught visually by showing the number line in a table or chart using 10 columns and as many rows as you want (though 10 is typical for illustrating the technique).

Using the table, begin by finding the cell containing the number 12. Because the operation is addition, you will proceed toward 100 (moving down for tens, and right for ones). Begin by moving down by "2" (the "2" in 27). Then, move to the right by "7" (the "7" in 27). You should land on 39 as result of these moves... the sum of 12 + 27. Subtraction works in reverse, (moving up for tens, and left for ones).

To begin:
Press the "New Problem" button to create a random problem and solve it using a hundreds table chart.

Need a tip?
When you check the show tip box. The starting box is colored blue, the 10s column is walked in grey, then the 1s column is walked in lighter grey, and finally the answer is colored green.

About this utility:
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