Have fun practicing the bridge to ten addition strategy (aka "Friends of Ten", "Sums of Ten", or "Make a Ten to Add") with these math center riddle activities. Your students will strategically add three numbers with sums within 20 and develop addition math fact fluency!

Because of the addend combinations in each clue, your students will always be able to start with a sum of ten and then add the third number.

Choosing from four numbers on each card, your students will determine the secret number by eliminating three of the options. With each card they complete, your students will solve three addition number models – lots of practice bridging to ten!

Here's what this addition resource includes!

☛ 24 math riddle cards, printing at four per page

☛ A full page version of each of the 24 riddles

☛ A themed 120 chart for support and easy differentiation

☛ A student recording page

☛ An answer key

☛ An easy prep one page board game that uses the riddle cards to practice the same addition strategies

How will you use this set of activities for addition within 20?

* Use in a math center for individual or partner work

* Use with your document camera for whole class review or to focus attention at the beginning of a math lesson

* Use as a skills review rotation, individually or with partners, with students moving to stations around the classroom to solve the clues

* Use for morning “bell ringers”

* Use the full page riddles to demonstrate on your interactive board, or use them on digital devices with your favorite apps.

* Use as exit tickets

* Use as challenge work

* Use for early finishers

* Use for RTI math intervention

* Use for homeschooling

Here's what teachers have said about this "bridge to ten - then add again" resource!

⭐⭐⭐⭐⭐ Anne said, "This was beyond perfect for my class. Probably the best center purchase I have made all year!"

⭐⭐⭐⭐⭐ Stacey said, "I added this to my Math centers rotation. Students loved it and I loved how they had to think a little deeper."

⭐⭐⭐⭐⭐ Stephanie said, "I especially appreciated how all of these riddles gave my 2nd graders lots of opportunity to practice with 1) finding combinations of 10 and then 2) adding the remaining addend to 10. Thank you! "

Supports CCSS 1.OA.A.2

1.OA.B.3

1.OA.C.6

2.OA.B.2

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Sums of Ten Ocean Theme Math Center Activities - Game, Sorts, Clip Cards

Dino's Secret Numbers: Adding and Subtracting Tens

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Linda Nelson

Copyright © Primary Inspiration by Linda Nelson

Permission to copy for single classroom use only.

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