Reception Maths: Ten and some more
Part of the Reception Maths numbers to 20 chapter. Chapter overview · whole chapter on one page
Ten and some more
Sam is making towers with counters. He fills one ten frame first. It has ten counters.
He keeps going with the second frame. He has ten, and some more. Ten and three more is 13.
Numbers from 11 to 19 are one ten and some ones.
Key ideas
- A teen number is one ten and some ones.
- The first ten frame is full: that is ten.
- The ones are the extra counters.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.12 − 10 = 2 ones
- Write the answer. Say it as a ten and some ones.12 is one ten and 2 ones
Check. Ten and 2 more makes 12: 10 + 2 = 12. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.15 − 10 = 5 ones
- Write the answer. Say it as a ten and some ones.15 is one ten and 5 ones
Check. Ten and 5 more makes 15: 10 + 5 = 15. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.18 − 10 = 8 ones
- Write the answer. Say it as a ten and some ones.18 is one ten and 8 ones
Check. Ten and 8 more makes 18: 10 + 8 = 18. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Watch out
Watch out: the ten comes first. Thirteen is one ten and three ones, not three tens and one one.
Exam tip
Grown-up tip. Use an egg box (ten holes) and counters or buttons. Fill the first row, then count the extras. Ask: “How many tens, and how many ones?”
Exercise 2A Ten and some more
Non-calculatorKey words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.11 − 10 = 1 one
- Write the answer. Say it as a ten and some ones.11 is one ten and 1 one
Check. Ten and 1 more makes 11: 10 + 1 = 11. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.14 − 10 = 4 ones
- Write the answer. Say it as a ten and some ones.14 is one ten and 4 ones
Check. Ten and 4 more makes 14: 10 + 4 = 14. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.17 − 10 = 7 ones
- Write the answer. Say it as a ten and some ones.17 is one ten and 7 ones
Check. Ten and 7 more makes 17: 10 + 7 = 17. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.19 − 10 = 9 ones
- Write the answer. Say it as a ten and some ones.19 is one ten and 9 ones
Check. Ten and 9 more makes 19: 10 + 9 = 19. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Method. Two full ten frames make twenty.
- Look at the first frame. It is full, so it has ten.10
- Look at the second frame. It is full too, so it has ten more.10 + 10
- Write the answer. 20
Check. Count in tens: 10, 20. ✓
Watch out. Two full frames is two tens, which is twenty.
Method. Use the ten and the ones to make the number.
- Start with the ten. One ten is 10.10
- Add the ones. Three ones are 3.10 + 3
- Write the answer. 13
Check. Count on from 10: 11, 12, 13. ✓
Watch out. Count on from 10, not from 1.
Method. Use the ten and the ones to make the number.
- Start with the ten. One ten is 10.10
- Add the ones. Eight ones are 8.10 + 8
- Write the answer. 18
Check. Count on from 10: 11, 12, 13, 14, 15, 16, 17, 18. ✓
Watch out. Eight ones makes 18 when they are added to 10.
Method. Ten and some more makes 15. Count on from 10 to find the missing ones.
- Start at 10. That is the ten.10
- Count on to 15. Count on one at a time: 11, 12, 13, 14, 15.11, 12, 13, 14, 15
- Count the ones you added. Five ones were added.5
- Write the answer. 5
Check. 10 + 5 = 15. ✓
Watch out. The gap is the number of ones, not the number 15.
Method. Ten is one full set. The extra cubes are the ones left over.
- Count the first ten. Ten cubes make one ten.10
- Take away the ten. What is left is the ones.16 − 10 = 6
- Write the answer. 6
Check. Ten and six more makes 16: 10 + 6 = 16. ✓
Watch out. Count the ten first, then count what is left.
Method. A teen number has one ten, not two.
- Think about 12. It is more than ten but less than twenty.12
- Break 12 into parts. One ten and the rest are ones.10 + 2
- Write the answer. No. 12 is one ten and two ones.
Check. Ten and two more makes 12. ✓
Watch out. Two tens would make 20, not 12.
Key words. A teen number is one ten and some ones, for example 13 is one ten and three ones.
Method. A teen number is one ten and some ones. Ten is one full ten frame.
- Find the ten. Ten is one full ten frame.1 ten = 10
- Count the ones left over. The ones are the extra counters.19 − 10 = 9 ones
- Write the answer. Say it as a ten and some ones.19 is one ten and 9 ones
Check. Ten and 9 more makes 19: 10 + 9 = 19. ✓
Watch out. The “ten” always comes first. Do not count the ten frame as ones.
Method. Look at the digit in the tens place and the digit in the ones place.
- Look at 15. The 1 is the tens and the 5 is the ones.1 ten and 5 ones
- Look at 51. The 5 is the tens and the 1 is the ones.5 tens and 1 one
- Write the answer. Accept any answer: 15 has one ten and five ones; 51 has five tens and one one.
Check. Check: 1 ten and 5 ones is 15. 5 tens and 1 one is 51. ✓
Watch out. The place of each digit matters.