New
New
Year 3

# Count forwards and backwards within 3-digits

I can count forwards and backwards using 3-digit numbers.

New
New
Year 3

# Count forwards and backwards within 3-digits

I can count forwards and backwards using 3-digit numbers.

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## Lesson details

### Key learning points

1. Place value helps us count on and back in 10s and 100s.
2. Place value helps us to know which digits change as we cross the 100s or 10s boundaries.
3. The 1s and 10s digits don’t change when you add a 100 to or subtract 100 from a 3-digit number.

### Common misconception

Pupils may struggle to cross 100s boundaries when adding 10s.

Base ten blocks can help with this concept. It also helps if children's attention is drawn towards the patterns in the number system.

### Keywords

• 100s boundary - The 100s boundary is the point at which the numbers change into 100s numbers or from one set of hundreds to another.

• Pattern - A pattern is a repeated set of numbers, shapes or objects.

This lesson covers counting in 10s and 100s. Pupils may find base ten blocks helpful in understanding why digits change or don't change when 10 or 100 is added or subtracted.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
What number comes next in the sequence?
Q2.
Sofia is counting forwards in 10s from 0. Put these numbers in the order that she will say them in.
1 - 20
2 - 40
3 - 70
4 - 110
Q3.
Which of these statements is correct?
Correct answer: “10 more than 55 equals 65”
“10 more than 55 equals 45”
“10 more than 55 equals 56”
Q4.
Match the statement with the correct answer.

53

Correct Answer:10 less than 87 ,77

77

Correct Answer:10 less than 41 ,31

31

Q5.
What number is represented by the base ten blocks?
Q6.
Which chart represents the largest 3-digit number?
b
c

## Exit quiz

### 6 Questions

Q1.
What number comes next in this sequence? 370, 380, 390,
Correct Answer: 400, 4 hundred, four hundred
Q2.
What is the missing number in this sequence?
Q3.
What are the missing numbers in this row and column?
430 and 560
460 and 530
340 and 650
Q4.
Match the statement to the correct answer.
Correct Answer:100 less than 670 ,570

570

771