Addition Fact Strategy Adding 8

Just Ask Judy
Grade Levels
1st - 2nd
Formats Included
  • PDF
47 total; 44 usable
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Just Ask Judy
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  1. Are you looking for ways to introduce and teach addition fact mental strategies in first and second grades? Here’s a money-saving bundle of 6 resources to help you teach 4 of the more challenging strategies for adding the basic facts to 20. Take a closer look at everything you’ll receive by clicking
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This is a set of resources to help you introduce and teach The 8 Rule (adding 8) addition fact strategy. It is a perfect pack of materials to help your first and second grade math students understand the concept underlying this strategy. As a prerequisite, your students need to be fluent with adding 10 to a single-digit number and counting back 2 from a given number. They should also be familiar with The 9 Rule addition fact strategy. The introductory activities are concrete and require multi-linking cubes (the ones that link on all sides), 2 sets of 10 in two different colors, for each participating student or pair of students. There are additional activities with manipulatives, pictures or equations to develop familiarity with the equations underlying this strategy. This set of activities is based on making a ten by subtracting two from the other addend. I have included color and black/ gray/ white options.

Check out a free sample from this resource!

These addition equations are covered in this resource:

  • 8 + 4
  • 8 + 5
  • 8 + 6
  • 8 + 7
  • 4 + 8
  • 5 + 8
  • 6 + 8
  • 7 + 8

This resource was crafted by Judy, a teacher with a master’s degree and more than 35 years of teaching experience.

This resource includes 44 usable pages:

  • 3 pages teacher information
  • 1 page color open-ended cube mat
  • 1 page color equation cards
  • 8 pages color equation cube mats
  • 4 pages color number strips/ rods
  • 2 pages color matching cube cards
  • 2 pages color matching equation cards
  • 1 page black/ white open-ended cube mat
  • 1 page black/ white equation cards
  • 8 pages black/ gray/ white equation cube mats
  • 4 pages black/ gray/ white number strips/ rods
  • 2 pages black/ white matching cube cards
  • 2 pages black/ white matching equation cards
  • 3 pages recording sheets (matching cube cards, matching equation cards)
  • 2 worksheets


Additional Resources You Might Like

Addition & Subtraction

Addition Fact Strategy Applying The 8 Rule


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Total Pages
47 total; 44 usable
Answer Key
Teaching Duration
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to see state-specific standards (only available in the US).
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.


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