Step-by-step Maths Level 1 Counting to 20: check-up and practice test questions

Method. One more means the next number when we count on.

1. Start at the number. We begin where we are.
   3
2. Count on one. Say the number that comes next.
   3 + 1 = 4
3. Write the answer.
   4

Check. Count back one: 4 take away 1 is 3. It works.

Watch out. One more is the next number, not the same number.

Method. One less means the number just before when we count back.

1. Start at the number. We begin where we are.
   11
2. Count back one. Say the number that comes just before.
   11 - 1 = 10
3. Write the answer.
   10

Check. Count on one: 10 add 1 is 11. It works.

Watch out. One less is the number before, not the number after.

Method. Count in steps of one. Say the numbers in order, then fill the gap.

1. Look at the numbers in order. Find the numbers next to the gap.
   8, 7, __, 5
2. Count one step at a time. Counting back means one less each time.
   8, 7, 6, 5
3. Write the missing number.
   6

Check. Say the whole line out loud. Every number is one more or one less than the one before. ✓

Watch out. Go one step at a time. Do not skip a number.

Method. Count in steps of one. Say the numbers in order, then fill the gap.

1. Look at the numbers in order. Find the numbers next to the gap.
   1, 2, 3, __, 5
2. Count one step at a time. Counting on means one more each time.
   1, 2, 3, 4, 5
3. Write the missing number.
   4

Check. Say the whole line out loud. Every number is one more or one less than the one before. ✓

Watch out. Go one step at a time. Do not skip a number.

Method. Say the number in order, then find its name.

1. Look at the numeral. It is a ten and some more.
   20
2. Say the number name. Teen numbers end with -teen.
   twenty
3. Write the answer.
   twenty

Check. Count on from ten to 20 and stop on twenty.

Watch out. Spell the teen words carefully: thirteen, fourteen, fifteen.

Method. Find the number that matches the word.

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

Check. Count on from 10 to 20 to check.

Watch out. Check the numeral has two digits and the ones are right.

Method. Say the number in order, then find its name.

1. Look at the numeral. It is a ten and some more.
   14
2. Say the number name. Teen numbers end with -teen.
   fourteen
3. Write the answer.
   fourteen

Check. Count on from ten to 14 and stop on fourteen.

Watch out. Spell the teen words carefully: thirteen, fourteen, fifteen.

Method. Make a ten first. Then count on the rest.

1. Make a ten. Ten things make one ten.
   10
2. Count on the rest. There are 2 more.
   10 + 2 = 12
3. Write the answer.
   12

Check. Count all the apples one at a time to check: you get 12. ✓

Watch out. Count the first ten, then count on. Do not start from 1 again.

Method. Make a ten first. Then count on the rest.

1. Make a ten. Ten things make one ten.
   10
2. Count on the rest. There are 9 more.
   10 + 9 = 19
3. Write the answer.
   19

Check. Count all the stars one at a time to check: you get 19. ✓

Watch out. Count the first ten, then count on. Do not start from 1 again.

Method. Look at the numbers next to the box. Count to find the missing number.

1. Look at the numbers either side. The box is between two numbers.
   11 and 13 are next to the box
2. Count on one. The number in the middle is one more than the one before.
   11 + 1 = 12
3. Write the answer.
   12

Check. Check: 12 is one less than 13. ✓

Watch out. Read the number line from left to right. Each mark is one more.

Method. One more means the next number when we count on.

1. Start at the number. We begin where we are.
   7
2. Count on one. Say the number that comes next.
   7 + 1 = 8
3. Write the answer.
   8

Check. Count back one: 8 take away 1 is 7. It works.

Watch out. One more is the next number, not the same number.

Method. One less means the number just before when we count back.

1. Start at the number. We begin where we are.
   15
2. Count back one. Say the number that comes just before.
   15 - 1 = 14
3. Write the answer.
   14

Check. Count on one: 14 add 1 is 15. It works.

Watch out. One less is the number before, not the number after.

Method. Count in steps of one. Say the numbers in order, then fill the gap.

1. Look at the numbers in order. Find the numbers next to the gap.
   5, 4, __, 2
2. Count one step at a time. Counting back means one less each time.
   5, 4, 3, 2
3. Write the missing number.
   3

Check. Say the whole line out loud. Every number is one more or one less than the one before. ✓

Watch out. Go one step at a time. Do not skip a number.

Method. Count in steps of one. Say the numbers in order, then fill the gap.

1. Look at the numbers in order. Find the numbers next to the gap.
   12, 13, 14, __, 16
2. Count one step at a time. Counting on means one more each time.
   12, 13, 14, 15, 16
3. Write the missing number.
   15

Check. Say the whole line out loud. Every number is one more or one less than the one before. ✓

Watch out. Go one step at a time. Do not skip a number.

Method. Say the number in order, then find its name.

1. Look at the numeral. It is a ten and some more.
   12
2. Say the number name. Teen numbers end with -teen.
   twelve
3. Write the answer.
   twelve

Check. Count on from ten to 12 and stop on twelve.

Watch out. Spell the teen words carefully: thirteen, fourteen, fifteen.

Method. Find the number that matches the word.

1. Say the number name. Listen to the whole word.
   eleven
2. Find the number. eleven is 11.
   eleven = 11
3. Write the numeral. Write both digits.
   11

Check. Count on from 10 to 11 to check.

Watch out. Check the numeral has two digits and the ones are right.

Method. Say the number in order, then find its name.

1. Look at the numeral. It is a ten and some more.
   12
2. Say the number name. Teen numbers end with -teen.
   twelve
3. Write the answer.
   twelve

Check. Count on from ten to 12 and stop on twelve.

Watch out. Spell the teen words carefully: thirteen, fourteen, fifteen.

Method. Make a ten first. Then count on the rest.

1. Make a ten. Ten things make one ten.
   10
2. Count on the rest. There are 7 more.
   10 + 7 = 17
3. Write the answer.
   17

Check. Count all the apples one at a time to check: you get 17. ✓

Watch out. Count the first ten, then count on. Do not start from 1 again.

Method. Make a ten first. Then count on the rest.

1. Make a ten. Ten things make one ten.
   10
2. Count on the rest. There are 0 more.
   10
3. Write the answer.
   20

Check. Count all the stars one at a time to check: you get 20. ✓

Watch out. Count the first ten, then count on. Do not start from 1 again.

Method. Look at the numbers next to the box. Count to find the missing number.

1. Look at the numbers either side. The box is between two numbers.
   2 and 4 are next to the box
2. Count on one. The number in the middle is one more than the one before.
   2 + 1 = 3
3. Write the answer.
   3

Check. Check: 3 is one less than 4. ✓

Watch out. Read the number line from left to right. Each mark is one more.