Understanding the sequence from 100 down to 0 means recognizing that each successive whole number is one less than the preceding number, including place-value changes at transitions such as 100 to 99 and 70 to 69. A number line represents this movement to the left and connects backward counting with finding a predecessor and beginning subtraction; this scope excludes negative numbers and counting backward by intervals other than one.
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To count backward, say the numbers in order from larger to smaller. Each number is 1 less than the number before it.
On a number line, counting backward means moving one step to the left.
Example: Count backward from to .
Notice that after comes . The hundreds digit changes because there are no numbers between and .
So, counting backward from to gives:
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