Hundreds Chart & Skip Counting Lab

Choose a skip count, watch the pattern light up on the hundreds chart, record what you find, and discover which numbers are multiples of 2, 5, 10, and more.

Guided Experiment: Skip Counting Patterns Investigation

Before you start, predict: when you count by 5, what will the last number in the hundreds chart be? What pattern will the numbers have?

Write your hypothesis in the Lab Report panel, then click Next.

Controls

Choose a skip count and start value, explore the pattern on the hundreds chart, then record what you find.

Counting Controls

First 5 numbers in sequence

2, 4, 6, 8, 10, ...

Last value on chart: 100 | Total highlighted: 50 | Pattern: All even numbers

Hundreds ChartCounting by 2 starting at 0

Highlighted cells show the skip counting pattern. Numbers 1-100.

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Data Table

(0 rows)
#
0 / 500
0 / 500
0 / 500

Reference Guide

Skip Counting

Skip counting means adding the same number over and over to make a sequence. When you count by 2, you add 2 each time: 2, 4, 6, 8, 10...

  • Count by 2. Every other number. These are even numbers.
  • Count by 5. Numbers that end in 0 or 5.
  • Count by 10. Numbers that end in 0.
  • Count by 3. Adds 3 each time. Does not end on 100.
Key idea: skip counting is multiplication in disguise. Counting by 4 six times gives 24, which is 4 times 6.

Patterns on the Hundreds Chart

The hundreds chart organizes numbers 1 to 100 in ten rows of ten. Skip counting patterns create visual shapes on the chart.

Counting by 10 highlights only the last column (10, 20, 30...). Counting by 2 highlights every other cell in every row. Counting by 5 highlights every fifth cell, making two columns.

Numbers highlighted by two different skip counts are multiples of both. Both 2 and 4 highlight the number 8, because 8 is a multiple of 2 and 4.

Even and Odd Numbers

Even numbers can be split into two equal groups with nothing left over. They are exactly divisible by 2: 2, 4, 6, 8, 10...

Odd numbers always have one left over when split into two groups. They are not divisible by 2: 1, 3, 5, 7, 9...

  • Even numbers always end in 0, 2, 4, 6, or 8.
  • Odd numbers always end in 1, 3, 5, 7, or 9.
  • Counting by 2 from 0 gives only even numbers.
  • Counting by 2 from 1 gives only odd numbers.

Multiples

A multiple of a number is what you get when you multiply that number by a whole number. The multiples of 3 are 3, 6, 9, 12, 15... and so on.

Skip counting by 3 gives you the multiples of 3. Every highlighted cell on the hundreds chart is a multiple of your chosen skip count.

  • Multiples of 2 and 10. 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
  • Multiples of 2 and 5. 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
  • Only some numbers divide 100 evenly (1, 2, 4, 5, 10, 20, 25, 50, 100).
Standards: K.CC.1, 2.NBT.2, 3.OA.5