Interactive hundred chart

What a hundred chart shows

A hundred chart is the numbers 1 to 100 written in ten rows of ten. Moving one square to the right adds 1, and moving one square down adds 10. That layout puts our number system on one page, so children see patterns instead of a long list of numbers.

On this page you can also switch to a 0 to 99 chart, where every number in a row shares the same tens digit. Color mode lets a child color squares in three colors. Skip count highlights every multiple of 2, 3, 4, 5 or 10, and choosing two buttons shows the numbers both lists share in a mixed color. Hide and seek covers some numbers so a child can work them out from their neighbors.

Why the patterns matter

The patterns are place value made visible. Multiples of 10 make a single column, multiples of 5 make two columns, and multiples of 2 fill every other column. Multiples of 3 run in slanting lines instead. The 5s line up because 5 fits into 10 exactly, so the pattern repeats every row; 3 does not fit into 10, so the pattern shifts along each row. The 4s repeat every two rows, because 4 fits into 20.

Common mix-ups

• Mixing up 10 more and 1 more. Tap a number and point out that 10 more is the square directly below and 1 more is the square to the right.
• Getting stuck at the end of a row. On the 1 to 100 chart, 1 more than 30 is 31, which starts the next row.
• Expecting every row to share a tens digit. On the 1 to 100 chart, 20 sits at the end of the row of teens. If that confuses a child, switch to 0 to 99.
• Thinking the first common multiple is always the two numbers multiplied. Press 2 and 4 together: the first shared number is 4, not 8.

A 10-minute hide-and-seek routine

• Choose Hide and seek. For each hidden square, the child says the number and how they know, such as "it is under 37, so it is 47."
• Tap to check. After a wrong guess, tap a neighbor and use the readout to rethink.
• Switch to Skip count, press 5 and count the highlighted squares aloud: 5, 10, 15 and so on.
• Press 2 as well and ask what the mixed-color numbers have in common. They are the multiples of 10.
• Finish in Color mode by coloring a plus shape around a number the child chooses, one color for each direction pair.

Where it fits by grade

• Kindergarten: count to 100 by ones and by tens (K.CC.A.1). In England, counting to 100 is a Year 1 goal.
• Grade 1: find 10 more or 10 less than a two-digit number without counting (1.NBT.C.5). Year 2 in England counts in steps of 2, 3 and 5 and in tens.
• Grade 2: skip count by 5s and 10s (2.NBT.A.2). Year 3 in England counts in multiples of 4 and 8 and finds 10 more or less.
• Grades 3 and 4: patterns in the times tables (3.OA.D.9) and factors, multiples and primes up to 100 (4.OA.B.4). In England, factors and multiples come in Year 5 and common multiples in Year 6.

Learning more

Place value and times tables are both skills on Eurekami's skill map, so Daily Practice can bring them back when they start to fade. Lessons draw diagrams live from the numbers in each question, and teachers can print worksheets with answer keys on the same skills.