Step-by-step Maths Level 2: Ten ones make one ten
Part of the Step-by-step Maths Level 2 tens and ones chapter. Chapter overview · whole chapter on one page
Ten ones make one ten
A ten is a group of ten ones. A full ten frame has ten counters, so it shows one ten.
If you have three groups of ten, you have three tens, and that is thirty ones.
Key ideas
- A ten is a group of ten ones.
- Two tens are twenty ones.
- Count in tens: 10, 20, 30 ...
Method. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.3 tens
- Count the ones in each ten. Ten ones in every ten.3 x 10 = 30
- 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.
- Count the tens. Each ten is a bundle of ten ones.5 tens
- Count the ones in each ten. Ten ones in every ten.5 x 10 = 50
- 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. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.8 tens
- Count the ones in each ten. Ten ones in every ten.8 x 10 = 80
- Write the answer. That is the total number of ones.80
Check. Count in tens to check: 10, 20, 30, 40, 50, 60, 70, 80.
Watch out. A ten is ten ones. Do not count the tens as ones.
Watch out
Watch out. Three tens are not three ones. Three tens is thirty ones.
Exam tip
Grown-up tip. Use ten cubes or ten buttons. Make a ten in a cup, then count the cups.
Exercise 2A Practice: tens and ones
Non-calculatorMethod. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.4 tens
- Count the ones in each ten. Ten ones in every ten.4 x 10 = 40
- 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.
- Count the tens. Each ten is a bundle of ten ones.7 tens
- Count the ones in each ten. Ten ones in every ten.7 x 10 = 70
- 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. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.9 tens
- Count the ones in each ten. Ten ones in every ten.9 x 10 = 90
- 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. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.2 tens
- Count the ones in each ten. Ten ones in every ten.2 x 10 = 20
- 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. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.5 tens
- Count the ones in each ten. Ten ones in every ten.5 x 10 = 50
- 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. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.8 tens
- Count the ones in each ten. Ten ones in every ten.8 x 10 = 80
- Write the answer. That is the total number of ones.80
Check. Count in tens to check: 10, 20, 30, 40, 50, 60, 70, 80.
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.
- Count the tens. Each ten is a bundle of ten ones.1 ten
- Count the ones in each ten. Ten ones in every ten.1 x 10 = 10
- 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. Ten ones make one ten. So we count the tens and then multiply by ten.
- Count the tens. Each ten is a bundle of ten ones.3 tens
- Count the ones in each ten. Ten ones in every ten.3 x 10 = 30
- 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. Count the ones in the tens.
- Look at the tens. Each ten has ten ones.4 tens
- Count the ones. Four tens is ten ones four times.4 x 10 = 40
- Compare with Sam. Sam has 40 ones, not 4 ones.No, 40 ones
Check. Count in tens: 10, 20, 30, 40.
Watch out. A ten is ten ones, so 4 tens is 40 ones.