How it works
This skip counting by 18 chart counts in twos, so the 20 stops to 360 fit in 18 rows, all but 360 on two diagonals. Read each jump's note in the list further down, then fill in the strip.
Read the full guide
Add 20, take 2
18 is 2 short of 20, so every jump is add 20, take 2: 126, 146, 144. On a chart that counts in twos, that move is one row down and one square left, which is why the stops form a diagonal. The ones digits run 8, 6, 4, 2, 0, the same endings as the 8s, and every 5 jumps add 90.
Quarter turns in the notes
The note on 72 + 18 = 90 says a quarter turn in degrees, and the notes on 180, 270 and 360 mark the half, the three quarters and the full turn. Numbers on the chart shortens the chart to 200, which holds 11 stops.
- Below 1,000, stops are even and their digits add to 9 or 18. 243 is odd. 236 adds to 11.
- Pupils who know the 9s already own this count. Say the 9s and keep every second stop: 18, 36, 54.
- Where the hundreds digit changes (90 to 108, 198 to 216, 288 to 306), go up 20, then back 2.
Questions and answers
What are the numbers when you count by 18?
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, 324, 342 and 360. That is 20 stops. Only the first 5, up to 90, are under 100, which is why this chart counts in twos.
Why does this chart count in twos?
Every stop of the 18s is even, so a chart of even numbers loses none of them and needs half the squares: 360 fits in 18 rows, not 36. To see the same numbers as facts, open the multiplication chart to 18.
Can I print a count by 18 sheet?
Yes. Print 6 counting strips, under the strip, prints six strips of the 18s, none past 198, with a key. Print the chart gives this chart of twos alone. Skip counting worksheets has no rows of 18s. Its nearest is Count by 9s to 108.