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Step-by-step practice: Maths · Level 1Chapter 2 · Counting to 20
Step-by-step Maths Level 1 · Counting to 20 · Lesson 2.2

Step-by-step Maths Level 1: Numbers 11 to 20

Part of the Step-by-step Maths Level 1 counting to 20 chapter. Chapter overview · whole chapter on one page

2.2

Numbers 11 to 20

Level 1
Read and write the numbers 11 to 20

The numbers 11 to 20 are teen numbers. They end with -teen, except 11 and 12.

Each teen number is a ten and some more: 13 is ten and three.

NumeralWord
11eleven
12twelve
13thirteen
14fourteen
15fifteen
16sixteen
17seventeen
18eighteen
19nineteen
20twenty
The numbers 11 to 20 as numerals and as words.

Key ideas

  • Teen numbers are 10 and some more.
  • Eleven and twelve do not end in -teen.
  • The numeral has two digits: 1 for the ten, then the ones.
Worked example 2.2.1
Write the number 13 as a word.

Method. Say the number and find its name.

  1. Look at the numeral. Find the number you need to name.
    13
  2. Say the number name. Each numeral has one number name.
    thirteen
  3. Write the answer.
    thirteen

Check. Count to 13 out loud and check you end on thirteen.

Watch out. Spell the number name carefully. Count the letters you can hear.

Worked example 2.2.2
Write the word “seventeen” as a numeral.

Method. Find the numeral for the number name.

  1. Say the number name. Listen to the word slowly.
    seventeen
  2. Find the number that matches. seventeen is the number 17.
    seventeen = 17
  3. Write the numeral.
    17

Check. Count to 17 and stop on 17.

Watch out. Read the whole number name, not just the first part.

Worked example 2.2.3
Write the number 20 as a word.

Method. Say the number and find its name.

  1. Look at the numeral. Find the number you need to name.
    20
  2. Say the number name. Each numeral has one number name.
    twenty
  3. Write the answer.
    twenty

Check. Count to 20 out loud and check you end on twenty.

Watch out. Spell the number name carefully. Count the letters you can hear.

Watch out

Watch out. Thirteen and thirty look alike when spoken fast. Thirteen is 13 and thirty is 30.

Exam tip

Grown-up tip. Say the teen numbers slowly: fourteen, fifteen, sixteen. Put ten and some more ones with two strips or two cups, so your child can see the ten first.

Exercise 2B  Numbers 11 to 20

Non-calculator
1
FWrite the number 13 as a word.
2
FWrite “seventeen” as a numeral.
3
FWrite the number 13 as a word.
4
FWrite “thirteen” as a numeral.
5
FWrite the number 17 as a word.
6
FWrite “eleven” as a numeral.
7
FWrite the number 12 as a word.
8
FWrite “nineteen” as a numeral.
9
FWrite the number 18 as a word.
10
FWrite “fifteen” as a numeral.
11
FWrite the number 17 as a word.
12
FWrite “twenty” as a numeral.
13
FWrite the number 18 as a word.
14
FWrite “seventeen” as a numeral.
15
PSWrite the number 18 as a word.
16
PSWrite “fourteen” as a numeral.

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