Rainbow Math Facts To 20

Mental Maths

Hey there, fellow educators! If you’ve been cruising through Rainbow Facts to 10 with your students, it’s time to extend their number knowledge to Rainbow Math Facts to 20!

Rainbow Maths Facts are a mental maths strategy to help students recall facts to help solve mental calculations. In this blog post, we will discuss what rainbow math facts to 20 are and how to teach them to kids

What are Rainbow Maths Facts To 20?

Just like Rainbow Maths Facts to 10, Rainbow Facts to 20 consists of pairs of numbers that, when added together, result in a sum of 20. These facts aren’t just about addition; they also lend themselves to related subtraction facts. That means when students are mastering addition facts to 20, it’s a great opportunity to introduce and reinforce those related subtraction facts simultaneously.

You might hear them referred to as “Friends of 10,” “Build-to-10,” or “Make-to-10” facts. Using the term “rainbow facts” alongside the imagery of a rainbow aids in helping students easily recall these pairs.

Why teach these facts? Well, they’re essential for building mental math skills. By mastering these pairs, students can add quickly and accurately. It’s all about developing fluency and confidence in math.

Of course, students might face some challenges along the way, like grasping the concept or recalling the number pairs. But with practice, they’ll get there.

Here’s a list of rainbow facts to 10 that shows the pattern when extended to facts to 20. It’s a useful visual to help your students see the number pattern:

  • 0 + 10 = 10 extends to 10 + 10 = 20
  • 1 + 9 = 10 extends to 11 + 9 = 20
  • 2 + 8 = 10 extends to 12 + 8 = 20
  • 3 + 7 = 10 extends to 13 + 7 = 20
  • 4 + 6 = 10 extends to 14 + 6 = 20
  • 5 + 5 = 10 extends to 15 + 5 = 20
  • 6 + 4 = 10 extends to 16 + 4 = 20
  • 7 + 3 = 10 extends to 17 + 3 = 20
  • 8 + 2 = 10 extends to 18 + 2 = 20
  • 9 + 1 = 10 extends to 19 + 1 = 20

Here’s a list of the related subtraction facts to 20:

  • 0 + 20 = 20 related subtraction fact 20 – 0 = 20
  • 1 + 19 = 20 related subtraction fact 20 – 1 = 19
  • 2 + 18 = 20 related subtraction fact 20 – 2 = 18
  • 3 + 17 = 20 related subtraction fact 20 – 3 = 17
  • 4 + 16 = 20 related subtraction fact 20 – 4 = 16
  • 5 + 15 = 20 related subtraction fact 20 – 5 = 15
  • 6 + 14 = 20 related subtraction fact 20 – 6 = 14
  • 7 + 13 = 20 related subtraction fact 20 – 7 = 13
  • 8 + 12 = 20 related subtraction fact 20 – 8 = 12
  • 9 + 11 = 20 related subtraction fact 20 – 9 = 11
  • 20 + 0 = 20 related subtraction fact 20 – 0 = 20

How To Teach Rainbow Maths Facts To 20

Teaching Rainbow Facts mental maths to kids is a great way to help them improve their basic addition skills. Here are some tips on how to do it:

  1. Start with Rainbow Facts To 10: Before introducing Rainbow Facts to 20, make sure your child is familiar with the basic addition facts to 10. This will make it easier for them to understand the concept of Rainbow Facts to 20.
  2. Use the Rainbow Facts Poster to show your students how to trace along a colour on the rainbow to find a partner pair.
  3. Use visual aids: You can use manipulatives like coloured counters or blocks to help your child visualise the Rainbow Facts. For example, if you are teaching the Rainbow Fact for the number 16 (2 + 14 = 16), you can use two blue MAB tens and four yellow ones to represent the numbers.
  4. Practice, practice, practice: Repetition is key when it comes to learning Rainbow Facts to 20. Encourage your child to practice regularly, and make sure they understand the concept before moving on to the next set of facts.
  5. Introduce the subtraction facts simultaneously and build a fact family of 4 to show how the same 3 numbers can be used to create 3 more facts.

Rainbow Facts To 20 Maths Task Cards

Rainbow Facts & Friends of 20 - Spin & Cover Task Cards

Rainbow Facts & Friends of 20 - Spin & Cover Task Cards

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 20 Rainbow Trace Task Cards

Rainbow Facts To 20 Rainbow Trace Task Cards

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 20 Clip it Task Cards

Rainbow Facts To 20 Clip it Task Cards

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 20 Base 10 Blocks

Rainbow Facts To 20 Base 10 Blocks

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 20 Ten Frame Task Cards

Rainbow Facts To 20 Ten Frame Task Cards

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts to 20 Part-Whole Number Bonds

Rainbow Facts to 20 Part-Whole Number Bonds

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

Oops, you need to log in to download this resource.
Rainbow Facts To 20 Fact Houses PowerPoint

Rainbow Facts To 20 Fact Houses PowerPoint

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PPTX

This content is available on our Premium plan. Upgrade now to access this resource.
Rainbow Facts To 20 Fact Houses

Rainbow Facts To 20 Fact Houses

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

Oops, you need to log in to download this resource.

Rainbow Math Facts To 20 Resources

Rainbow Facts & Friends of 20 Classroom Posters

Rainbow Facts & Friends of 20 Classroom Posters

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts & Friends of 20 Spinner Games

Rainbow Facts & Friends of 20 Spinner Games

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts Display Kit (20)

Rainbow Facts Display Kit (20)

Foundation - Year 1 - Year 2 - Mental Maths - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 100 Posters

Rainbow Facts To 100 Posters

Foundation - Year 1 - Year 2 - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 100 Puzzles

Rainbow Facts To 100 Puzzles

Foundation - Year 1 - Year 2 - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 100 Worksheets

Rainbow Facts To 100 Worksheets

Foundation - Year 1 - Year 2 - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.
Rainbow Facts To 100 Write & Wipe Math Centre

Rainbow Facts To 100 Write & Wipe Math Centre

Foundation - Year 1 - Year 2 - Addition - PDF

This content is available on our paid plans. Upgrade now to download this resource.

More Mental Maths Resources

Place Value Partitioning Numbers
Place Value Partitioning Numbers

Place Value - Partitioning Numbers

Commutative Property
Commutative Property

Commutative Property - Flip-Flops Addition Mental Maths

Mental Maths Online Games
Mental Maths Online Games

Digi Mental Maths Strategies Games

Rainbow Facts Addition To 20 (ten frames)
Rainbow Facts Addition To 20 (ten frames)

Addition Rainbow Facts -20 (ten frames)

Rainbow Facts Addition To 10 (ten frames)
Rainbow Facts Addition To 10 (ten frames)

Addition Rainbow Facts -10 (ten frames)

Rainbow Facts to 30 (missing numbers)
Rainbow Facts to 30 (missing numbers)

Addition Rainbow Facts - 30 (missing Numbers)

Rainbow Facts To 20 (missing numbers)
Rainbow Facts To 20 (missing numbers)

Addition Rainbow Facts -20 (missing numbers)

Rainbow Facts to 10 (missing numbers)
Rainbow Facts to 10 (missing numbers)

Addition Rainbow Facts -10 (missing numbers)

Mental Math Strategies Year 2 
Mental Math Strategies Year 2 

Explore Our Mental Maths Strategies Collection

Doubles – Near Doubles Mental Maths Strategy
Doubles – Near Doubles Mental Maths Strategy

Doubles & Near Doubles Mental Maths Strategy

Counting On Mental Maths Strategy
Counting On Mental Maths Strategy

Counting On Mental Maths Strategy

Partitioning Mental Maths Strategies {No Drill}
Partitioning Mental Maths Strategies {No Drill}

Partitioning / Split Mental Maths Strategy

Can't find what you're looking for?

Send us a request! Use this form to request a resource. Please give details of the learning area, topic, year level, curriculum links. We’ll be happy to take a look to see if we can fit it in. Unfortunately a request does not guarantee we will be able to make it!

"*" indicates required fields

Name*
NOTE: Please refrain from using this form to request subscription cancellations, as we do not handle subscription management for members. Members can manage or cancel their subscriptions through their Dashboard or via Paypal or your credit card company. Please see the FAQ page for detailed instructions.
This field is for validation purposes and should be left unchanged.
contact-us