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What number do you get if you take 30 away from 95?

Year 2 Calculation - Addition and Subtraction of Two-Digit Numbers

Add and subtract two-digit numbers using tens and ones. Partition numbers, count on or back, and use number lines to solve everyday problems with confidence.

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Fascinating Fact:

When you add two big numbers, do tens then ones, so 27 + 42 becomes 20 + 40 = 60 and 7 + 2 = 9, which makes 69 altogether.

In KS1 Maths, Year 2 pupils add and subtract two-digit numbers by partitioning into tens and ones, counting on or back, and using number lines. These strategies build speed and accuracy.

Key Terms

Partition: Split a number into tens and ones, e.g. 42 = 40 and 2.
Tens and ones: Place value parts of a number, like 58 = 5 tens and 8 ones.
Number line: A line you hop along to add or subtract in steps.

Try a quick warm-up first: play the Addition Game before starting the quiz.

Frequently Asked Questions (Click to see answers)

How do I add two-digit numbers in Year 2?

Partition into tens and ones, add tens, add ones, then combine. For example, 36 + 23: 30 + 20 = 50, 6 + 3 = 9, total = 59.

How do I subtract two-digit numbers?

Count back on a number line or subtract tens then ones. Example: 54 − 21: 50 − 20 = 30, 4 − 1 = 3, total = 33.

What if adding the ones crosses a ten?

Make a friendly ten. For 27 + 18: 27 + 3 = 30, 30 + 15 = 45. Bridging 10 (or 30, 40) keeps steps simple.

Try These Related Quizzes

Question 1

What is 37 + 44?

Partitioning into tens and ones may be useful

Question 2

What is 68 - 24?

Again, partitioning numbers can prove useful

Question 3

What is 54 + 29?

Adding 30 to 54, and then taking away the extra 1 is a good strategy to use

Question 4

What is 33 + 33

Doubling the tens and doubling the units gives the same answer

Question 5

What is 56 - 37?

Imagining this calculation in two jumps of - 30 and then -7 might make it more manageable

Question 6

What is 57 - 19?

Subtracting 20 is easier, but means one needs to be added back on

Question 7

What is 32 + 48?

Recognising that 2 + 8 is a number bond which makes 10 might make things easier

Question 8

What is 78 - 69?

Sometimes, counting up to find the difference is a good strategy when the numbers are quite close together

Question 9

What is 98 - 12?

You could check the answer is correct by adding 86 and 12 to check it's 98

Question 10

What is 44 + 23?

Partitioning the numbers into 40 + 20 and 4 + 3 is a useful strategy here

You can find more about this topic by visiting BBC Bitesize - Adding and subtracting

Author: Angela Smith (Primary School Teacher & KS1 Quiz Writer)

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