Visualising Numbers Counting, numbers and amounts to 20, with shapes and pictures Click each time to count and see what happens
1 one
2 two
3 triangle three
4 four square
5 five pentagon
6 six hexagon
7 seven heptagon
8 eight octagon
9 nonagon nine
10 ten decagon
11 10 10 + 1 + hendecagon eleven
12 10 + dodecagon twelve
13 10 + baker’s dozen thirteen
14 fourteen 10 + two weeks : a fortnight monday monday tuesday tuesday wednesday wednesday thursday thursday + friday friday saturday saturday sunday sunday two weeks : a fortnight fourteen
15 10 + fifteen minutes fifteen seconds fifteen ¼ of an hour
16 10 + + sixteen
17 10 + seventeen
18 10 + eighteen
19 10 + nineteen 20 – 1
+ 20 10 10 2 + twenty