KS1 (Age 5-7)KS2 (Age 7-11)11 Plus (Age 7-11)KS3 (Age 11-14)GCSE (Age 14-17)PSHE A.I.ESL Spanish Specialist Games

Need help with Year 2 Calculation - Addition and Subtraction Facts to 100? Ask our AI Tutor!

AI Tutor - Lucy

Connecting with Tutor...

Please wait while we establish connection

Hi! I'm Lucy, your AI tutor. How can I help you with Year 2 Calculation - Addition and Subtraction Facts to 100 today?

now

10 + 90, 20 + 80, 30 + 70, 40 + 60 and 50 + 50 all add up to 100.

Year 2 Calculation - Addition and Subtraction Facts to 100

Learn pairs that make 100. Spot tens, use a hundred square, and flip facts to check. Quick patterns help you add and subtract fast and accurately.

Explore the Topic →

(quiz starts below)

Fascinating Fact:

10 + 90, 20 + 80, 30 + 70, 40 + 60, and 50 + 50 all make 100. High five each pair.

In KS1 Maths, Year 2 pupils learn number bonds to 100 and use them for quick addition and subtraction. Knowing complements to 100 helps spot patterns, check answers, and solve problems efficiently.

Key Terms

Number bond to 100: Two numbers that add to 100, like 35 + 65 = 100.
Tens and ones: The place value parts of a number, for example 47 has 4 tens and 7 ones.
Fact family: A set of linked addition and subtraction facts, such as 20 + 80 = 100, 80 + 20 = 100, 100 − 20 = 80, 100 − 80 = 20.

Warm up with quick pairs to 100: try the Addition Game before you start the quiz.

Frequently Asked Questions (Click to see answers)

What are number bonds to 100?

Number bonds to 100 are pairs of numbers that total 100, like 12 + 88 or 47 + 53. Learning these pairs speeds up mental addition and subtraction.

How do I find a quick complement to 100?

Look at the ones first, then the tens. For 37, 3 tens need 7 tens and 7 ones need 3 ones, so 37 pairs with 63 to make 100.

How do bonds to 100 help with subtraction?

If you know 37 + 63 = 100, then 100 − 37 = 63 and 100 − 63 = 37. Reversing an addition fact gives two subtraction facts.

Try These Related Quizzes

Question 1

Which three pairs of numbers all add up to 100?

20 + 80
10 + 90
50 + 50

10 + 80
20 + 18
60 + 4

12 + 18
20 + 8
100 + 10

40 + 6
50 + 5
10 + 9

All the others give different totals

Question 2

Which 'family' of facts is incorrect?

35 + 65 = 100
65 + 35 = 100
100 - 35 = 65
100 - 65 = 35

25 + 75 = 100
75 + 25 = 100
100 - 25 = 75
100 - 75 = 25

15 + 85 = 100
85 + 15 = 100
100 - 85 = 15
100 - 15 = 85

65 + 45 = 100
45 + 65 = 100
100 - 65 = 45
100 - 45 = 65

65 + 45 = 110, so all the other facts must be incorrect too

Question 3

Which of the following is true?

10 - 80 = 20

100 - 20 = 80

80 - 20 = 100

20 - 80 = 100

100 - 80 = 20 is the other subtraction fact for these numbers

Question 4

Which of these three other facts go with 30 + 70 = 100?

100 + 30 = 70
70 - 30 = 100
30 - 70 = 100

30 + 30 = 70
70 - 30 = 100
30 - 100 = 70

70 + 70 = 100
30 +30 = 100
100 - 100 = 30

70 + 30 = 100
100 - 30 = 70
100 - 70 = 30

For the subtraction facts, the largest number should be at the beginning

Question 5

Which 'family' of facts is incorrect?

10 + 90 = 100
90 + 10 = 100
100 - 90 = 10
100 - 10 = 90

20 + 80 = 100
80 + 20 = 100
100 - 20 = 80
100 - 80 = 20

60 + 50 = 100
50 + 60 = 100
100 - 60 = 50
100 - 50 = 60

30 + 70 = 100
70 + 30 = 100
100 - 30 = 70
100 - 70 = 30

60 + 50 = 110, so all the other facts must be incorrect too

Question 6

If you know that 2 + 8 = 10, what else do you know?

20 + 80 = 100

12 + 18 = 20

2 + 80 = 100

8 + 20 = 100

80 + 20 would also give 100

Question 7

Which number fact is incorrect?

6 + 40 = 100

60 + 40 = 100

40 + 60 = 100

100 - 60 = 40

6 + 40 = 46!

Question 8

Which one of the following number pairs do not add up to give 100?

100 + 0

90 + 10

60 + 40

20 + 18

20 + 18 = 38

Question 9

Which of the following is true?

6 + 4 = 10, so 60 + 4 = 100

6 + 4 = 10, so 60 + 40 = 100

6 + 4 = 10, so 16 + 14 = 100

6 + 4 = 10, so 6 + 40 = 100

60 + 40 gives an answer which is ten times bigger than 6 + 4

Question 10

Which number is missing: 10 + ? = 100

100

10 + 90 = 100, so 90 + 10 = 100 also

You can find more about this topic by visiting BBC Bitesize - Fact families - addition facts

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

**Unlimited Quizzes Await You! 🚀**

Hey there, quiz champ! 🌟 You've already tackled today's free questions.
Ready for more?

🔓 Unlock UNLIMITED Quizzes and challenge yourself every day. But that's
not all...

🔥 As a Subscriber you can join our thrilling "Daily Streak" against other
quizzers. Try to win a coveted spot on our Hall of Fame Page.

Don't miss out! Join us now and keep the fun rolling. 🎉

Subscribe & Play

**Unlimited Quizzes Await You! 🚀**

Hey there, quiz champ! 🌟 You've already tackled today's free questions. Ready for more?

🔓 Unlock UNLIMITED Quizzes and challenge yourself every day. But that's not all...

🔥 As a Subscriber you can join our thrilling "Daily Streak" against other quizzers. Try to win a coveted spot on our Hall of Fame Page.

Don't miss out! Join us now and keep the fun rolling. 🎉

Subscribe & Play

Contact Details

Education Quizzes

Heron's Way, Wragg Marsh
Spalding
Lincolnshire
PE12 6HH
England

Email

admin@educationquizzes.com

Customer Service

Home Page Parents Students Tutors Teachers
Colour Filters Safe AI
Your Account

Here To Help

About Us

Our Team Testimonials Parent Reviews Terms and Conditions Privacy Policy

Leave Feedback