Adventures with the Number 18

18 is “eighteen”. It represents a quantity of eighteen things when we count.

You spell 18 as “eighteen”.

The number before 18 is 17, and the number after is 19.

The number eighteen is a big and balanced number! It's made up of a '1' (representing one full group of ten) and an '8' (representing eight single units). When you see '18', you know it's a code for 'one ten and eight more'. Eighteen is a very satisfying number because it's even and can be split into many different equal groups: two groups of nine, three groups of six, or nine groups of two! In many places, turning eighteen is a major milestone—it's the age you officially become an adult. Understanding 'eighteen' helps children master the 'teens' and builds their confidence with larger numbers.

It’s pronounced [eɪˈtiːn]. You can also clap the syllables as you say “eighteen” to make it stick.

Eighteen dots require two ten-frames: one completely full frame, and a second frame with eight dots. This is a clear picture of '10 + 8'.

Start at 0 and count forward to 18. You can also jump by 2s or 5s to build flexible counting.

18 is even, so it can be split into two equal groups with none left over.

Look for 18 on calendars, house numbers, page numbers, sports scores, and signs. Spotting it “in the wild” makes it easier to remember.

This is a great hands-on engineering and counting activity. The challenge is to build a small city using exactly eighteen items. You can use building blocks, but it's even more fun with a variety of materials! Use three blocks to build a house, six recycled containers to build a skyscraper, and nine craft sticks to build a bridge. (3 + 6 + 9 = 18). This activity is a fantastic way to practice counting to a large number while also being creative and introducing the concept of addition. It turns a simple building game into a city-planning adventure.

This is a fun, high-energy gross motor game that is great for practicing counting and estimating time. The game is simple: you challenge your child to do an activity for exactly eighteen seconds. For example: 'How many times can you jump in eighteen seconds?' or 'How many times can you clap your hands in eighteen seconds?'. You can count aloud together as the seconds tick by. This game helps children develop a sense of time and rhythm, and it makes counting to a higher number a joyful and physical experience. It's a great way to get the wiggles out and practice at the same time.

This is a wonderful activity for practicing sharing, counting, and early division. You'll need eighteen of a small snack, like crackers or grapes, and a few 'friends' (stuffed animals are perfect!). The mission is to share the eighteen snacks fairly among all the friends. For example, 'We have eighteen crackers and three friends. How many crackers does each friend get?'. Work together to deal out the crackers one by one to each friend. This provides a very concrete and tangible lesson in division and fairness. It's a delicious way to learn an important math and life skill.

A few minutes a few times a week is perfect. Consistency matters more than long sessions, so keep it playful and connected.