Step-by-step Maths Level 2 Tens and ones: check-up and practice test questions

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   1 ten
2. Count the ones in each ten. Ten ones in every ten.
   1 x 10 = 10
3. Write the answer. That is the total number of ones.
   10

Check. Count in tens to check: 10.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Say the number name and find its numeral.

1. Say the number name. Listen to the whole word.
   twenty
2. Find the numeral. twenty is the number 20.
   twenty = 20
3. Write the numeral.
   20

Check. Count to 20 and check you say twenty at the end.

Watch out. Thirteen is 13: the 3 is at the end, as in the ones word.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   9 tens
2. Count the ones in each ten. Ten ones in every ten.
   9 x 10 = 90
3. Write the answer. That is the total number of ones.
   90

Check. Count in tens to check: 10, 20, 30, 40, 50, 60, 70, 80, 90.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Put the tens together, then add the ones.

1. Find the tens. Each ten is worth ten.
   5 tens = 50
2. Add the ones. The ones are added on to the tens.
   50 + 4 = 54
3. Write the number.
   54

Check. Split 54 back into tens and ones: 5 tens and 4 ones.

Watch out. The ones are not added to the tens digit: 3 tens and 5 ones is 35, not 8.

Method. Put the tens together, then add the ones.

1. Find the tens. Each ten is worth ten.
   7 tens = 70
2. Add the ones. The ones are added on to the tens.
   70 + 4 = 74
3. Write the number.
   74

Check. Split 74 back into tens and ones: 7 tens and 4 ones.

Watch out. The ones are not added to the tens digit: 3 tens and 5 ones is 35, not 8.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   2 tens
2. Count the ones in each ten. Ten ones in every ten.
   2 x 10 = 20
3. Write the answer. That is the total number of ones.
   20

Check. Count in tens to check: 10, 20.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Change the tens word to tens, then add the ones.

1. Change the tens word. thirty is 3 tens.
   3 tens = 30
2. Add the ones. Put the ones on the end.
   30 + 5 = 35
3. Write the answer.
   35

Check. 35 has 3 tens and 5 ones.

Watch out. Ask yourself: how many tens are in the number?

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   7 tens
2. Count the ones in each ten. Ten ones in every ten.
   7 x 10 = 70
3. Write the answer. That is the total number of ones.
   70

Check. Count in tens to check: 10, 20, 30, 40, 50, 60, 70.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. The tens digit tells us the tens. The ones digit tells us the ones.

1. Look at the first digit. It is the number of tens.
   4 tens
2. Look at the second digit. It is the number of ones.
   3 ones
3. Write the answer. Say the tens, then the ones.
   4 tens and 3 ones

Check. 4 tens is 40, and 40 + 3 = 43.

Watch out. Read the digits from left to right. The left digit is the tens.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   3 tens
2. Count the ones in each ten. Ten ones in every ten.
   3 x 10 = 30
3. Write the answer. That is the total number of ones.
   30

Check. Count in tens to check: 10, 20, 30.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   7 tens
2. Count the ones in each ten. Ten ones in every ten.
   7 x 10 = 70
3. Write the answer. That is the total number of ones.
   70

Check. Count in tens to check: 10, 20, 30, 40, 50, 60, 70.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Say the number name for each numeral from 0 to 20.

1. Look at the numeral. It is less than 21.
   15
2. Say its name. Each number from 0 to 20 has its own name.
   fifteen
3. Write the answer.
   fifteen

Check. Count to 15 and stop on fifteen.

Watch out. Some teen names look alike. Thirteen and thirty are different numbers.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   4 tens
2. Count the ones in each ten. Ten ones in every ten.
   4 x 10 = 40
3. Write the answer. That is the total number of ones.
   40

Check. Count in tens to check: 10, 20, 30, 40.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   6 tens
2. Count the ones in each ten. Ten ones in every ten.
   6 x 10 = 60
3. Write the answer. That is the total number of ones.
   60

Check. Count in tens to check: 10, 20, 30, 40, 50, 60.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Say the number name and find its numeral.

1. Say the number name. Listen to the whole word.
   thirteen
2. Find the numeral. thirteen is the number 13.
   thirteen = 13
3. Write the numeral.
   13

Check. Count to 13 and check you say thirteen at the end.

Watch out. Thirteen is 13: the 3 is at the end, as in the ones word.

Method. Ten ones make one ten. So we count the tens and then multiply by ten.

1. Count the tens. Each ten is a bundle of ten ones.
   5 tens
2. Count the ones in each ten. Ten ones in every ten.
   5 x 10 = 50
3. Write the answer. That is the total number of ones.
   50

Check. Count in tens to check: 10, 20, 30, 40, 50.

Watch out. A ten is ten ones. Do not count the tens as ones.

Method. Say the number name for each numeral from 0 to 20.

1. Look at the numeral. It is less than 21.
   4
2. Say its name. Each number from 0 to 20 has its own name.
   four
3. Write the answer.
   four

Check. Count to 4 and stop on four.

Watch out. Some teen names look alike. Thirteen and thirty are different numbers.

Method. Put the tens together, then add the ones.

1. Find the tens. Each ten is worth ten.
   3 tens = 30
2. Add the ones. The ones are added on to the tens.
   30 + 0 = 30
3. Write the number.
   30

Check. Split 30 back into tens and ones: 3 tens and 0 ones.

Watch out. The ones are not added to the tens digit: 3 tens and 5 ones is 35, not 8.

Method. The tens digit tells us the tens. The ones digit tells us the ones.

1. Look at the first digit. It is the number of tens.
   6 tens
2. Look at the second digit. It is the number of ones.
   8 ones
3. Write the answer. Say the tens, then the ones.
   6 tens and 8 ones

Check. 6 tens is 60, and 60 + 8 = 68.

Watch out. Read the digits from left to right. The left digit is the tens.

Method. Say the number name and find its numeral.

1. Say the number name. Listen to the whole word.
   seven
2. Find the numeral. seven is the number 7.
   seven = 7
3. Write the numeral.
   7

Check. Count to 7 and check you say seven at the end.

Watch out. Thirteen is 13: the 3 is at the end, as in the ones word.