Year 2: Numbers in numerals and in words
Part of the Year 2 place value to 100 chapter. Chapter overview · whole chapter on one page
Numbers in numerals and in words
We can write a number with digits, like 36. This is a numeral.
We can also write it in words, like thirty-six.
Numbers from 11 to 19 have special names. For example, fifteen.
Other numbers have a tens word and a ones word.
Key ideas
- A numeral uses digits, like 36.
- Words are the name of the number, like thirty-six.
- Numbers from 11 to 19 have special names.
- A hyphen joins the tens word and the ones word.
- One hundred is written as 100.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Split the number into tens and ones. The tens come first, then the ones.36 = 3 tens and 6 ones
- Write the tens word. 3 tens is written as thirty.thirty
- Add the ones word after a hyphen. A hyphen joins the tens word and the ones word.thirty-six
Check. Read it back: thirty-six is 36. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Method. Break the word into a tens word and a ones word.
- Find the tens word. forty means 4 tens.forty = 40
- Find the ones word. The ones word comes after the hyphen.two = 2
- Add the tens and the ones. Put the tens and the ones together.40 + 2 = 42
- Write the answer. 42
Check. Say the number: forty-two is 42. ✓
Watch out. The tens word comes first, like thirty in thirty-six.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Look at the number. Some numbers have their own names, from 0 to 19.15
- Write the name. Write the word for the whole number.fifteen
- Check the spelling. Spell each part carefully.fifteen
Check. Read it back: fifteen is 15. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Watch out
Watch out: thirteen and thirty sound alike. Thirteen is 13. Thirty is 30.
Exam tip
Grown-up tip. Say the number out loud and clap each part: thir-teen, thir-ty. Ask: “Which word ends in -teen?”
Exercise 1D Numbers in numerals and words
Non-calculatorKey words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Look at the number. Some numbers have their own names, from 0 to 19.13
- Write the name. Write the word for the whole number.thirteen
- Check the spelling. Spell each part carefully.thirteen
Check. Read it back: thirteen is 13. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Split the number into tens and ones. The tens come first, then the ones.20 = 2 tens and 0 ones
- Write the tens word. 2 tens is written as twenty.twenty
- Add the ones word after a hyphen. There are no ones, so there is no ones word.twenty
Check. Read it back: twenty is 20. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Method. Break the word into a tens word and a ones word.
- Find the tens word. thirty means 3 tens.thirty = 30
- Find the ones word. The ones word comes after the hyphen.four = 4
- Add the tens and the ones. Put the tens and the ones together.30 + 4 = 34
- Write the answer. 34
Check. Say the number: thirty-four is 34. ✓
Watch out. The tens word comes first, like thirty in thirty-six.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Split the number into tens and ones. The tens come first, then the ones.47 = 4 tens and 7 ones
- Write the tens word. 4 tens is written as forty.forty
- Add the ones word after a hyphen. A hyphen joins the tens word and the ones word.forty-seven
Check. Read it back: forty-seven is 47. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Split the number into tens and ones. The tens come first, then the ones.63 = 6 tens and 3 ones
- Write the tens word. 6 tens is written as sixty.sixty
- Add the ones word after a hyphen. A hyphen joins the tens word and the ones word.sixty-three
Check. Read it back: sixty-three is 63. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Split the number into tens and ones. The tens come first, then the ones.81 = 8 tens and 1 one
- Write the tens word. 8 tens is written as eighty.eighty
- Add the ones word after a hyphen. A hyphen joins the tens word and the ones word.eighty-one
Check. Read it back: eighty-one is 81. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Method. Break the word into a tens word and a ones word.
- Find the tens word. ninety means 9 tens.ninety = 90
- Find the ones word. The ones word comes after the hyphen.six = 6
- Add the tens and the ones. Put the tens and the ones together.90 + 6 = 96
- Write the answer. 96
Check. Say the number: ninety-six is 96. ✓
Watch out. The tens word comes first, like thirty in thirty-six.
Method. Break the word into a tens word and a ones word.
- Find the tens word. seventy means 7 tens.seventy = 70
- Find the ones word. The ones word comes after the hyphen.two = 2
- Add the tens and the ones. Put the tens and the ones together.70 + 2 = 72
- Write the answer. 72
Check. Say the number: seventy-two is 72. ✓
Watch out. The tens word comes first, like thirty in thirty-six.
Method. Break the word into a tens word and a ones word.
- Find the tens word. forty means 4 tens.forty = 40
- Find the ones word. The ones word comes after the hyphen.eight = 8
- Add the tens and the ones. Put the tens and the ones together.40 + 8 = 48
- Write the answer. 48
Check. Say the number: forty-eight is 48. ✓
Watch out. The tens word comes first, like thirty in thirty-six.
Method. Read each word carefully, then compare the numbers.
- Read the word Sam used. Forty-one is 41.forty-one = 41
- Look at the number 14. Fourteen is 14, one of the special teen names.fourteen = 14
- Compare them. They are different numbers.41 is not 14
- Write the answer. No. 14 is fourteen.
Check. Count on from 10: 11, 12, 13, 14. That is fourteen. ✓
Watch out. Look for the teen ending. Fourteen has the -teen sound.
Key words. A numeral is a number written with digits, like 36. Words are written out, like thirty-six.
Method. Say the number out loud, then write the words for it.
- Split the number into tens and ones. The tens come first, then the ones.35 = 3 tens and 5 ones
- Write the tens word. 3 tens is written as thirty.thirty
- Add the ones word after a hyphen. A hyphen joins the tens word and the ones word.thirty-five
Check. Read it back: thirty-five is 35. ✓
Watch out. Put a hyphen between the tens word and the ones word, like thirty-six.
Method. One hundred is written with three digits.
- Say the words. One hundred comes after ninety-nine.one hundred
- Write the digits. One hundred has 1 hundred, 0 tens and 0 ones.1 hundred, 0 tens, 0 ones
- Write the number. 100
Check. Count on from 99 to 100. ✓
Watch out. One hundred has three digits: 1, 0, 0.
Method. Count in tens from 0 up to 100.
- Count in tens. Each ten is one group of ten.10, 20, 30 ... 100
- Count how many tens. Each number in the list is one ten.10 tens make 100
- Write the answer. 10
Check. 10 tens = 100. ✓
Watch out. One hundred is ten tens.