Skip-count by 2s, 5s, and 10s

Skip-counting by 2, 5, and 10 involves generating, extending, and interpreting whole-number sequences by repeatedly adding or subtracting a fixed interval, recognizing the terms as multiples of that interval and locating the pattern on a number line or hundred chart. This understanding connects equal groups with multiplication, supports finding missing terms and quantities, and highlights place-value patterns; it does not include generalized skip-counting rules for arbitrary intervals or more advanced number systems.

Detailed Explanation: Skip-count by 2s, 5s, and 10s

Skip-counting means adding the same number each time.

By $2$ s: add $2$ each time.
By $5$ s: add $5$ each time.
By $10$ s: add $10$ each time.

Example

Find the missing number:

15,\ 20,\ \square,\ 30,\ 35

Look at the first two numbers: $15$ to $20$ .
The numbers increase by $5$ because $20-15=5$ .
Keep adding $5$ :

20+5=25

Check the pattern:

15,\ 20,\ 25,\ 30,\ 35

So, the missing number is

\boxed{25}

On a number line, this pattern makes equal jumps of $5$ . Skip-counting by $5$ s is also counting equal groups: $25$ is $5$ groups of $5$ .

Learn by doing: Skip-count by 2s, 5s, and 10s

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Skip Counting Upward by Single Digits - Next 3 in Pattern

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