Start here
Build It Fill the frames yourself — tap to add counters! 
Ten-Frame Add & Subtract Fill the frames to add and take away — make ten! 
Number Bonds Split a whole into two parts and put them back. 
Add & Subtract to 100 Hop along the number line with bigger numbers. How does your body feel?
Pick something to play
Sumi's Acorn Market Run the market! Fill orders with loose acorns and bags of ten. Fact Friends Pick the answer, then say whose way you used — Sumi, Pippa or Tenny. Make the Number Squish two Nooms together to make the target number. Build It Fill the frames yourself to build the sum — tap to add counters! Ten-Frame Add & Subtract Fill the frames to add and take away — make ten! Number Bonds Split a whole into two parts and put them back. Trade Ten Hammer ten ones into a ten, chisel a ten back — watch the sum write itself. Tens & Ones Bundle ten ones into a ten-rod — see the number. Add & Subtract to 100 Hop along the number line with bigger numbers. Count By Skip-count by 2s, 5s, and 10s — spot the pattern and fill the missing number. Story Problems Read a story and pick the number sentence that matches. Fact Fluency Practice facts till they pop — no clock, ever!
Cast, stories & more
Meet the cast — the characters who teach this
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Sumi Add & subtract (counting on / back) — a warm acorn-orange squirrel kid who hops forward and back along a number line to add and take away; dotted jump-arcs mark each equal hop -
Pippa Number bonds / fact families (part–part–whole) — a soft cream-and-grey rabbit kid who splits a pile into two parts and joins them back; two little baskets and one whole basket beside her -
Tenny Place value (tens & ones) — a friendly many-segmented centipede kid whose ten body-segments bundle into a ten-rod and unbundle into ones; a tidy ten-rod and loose unit-cubes beside her -
Zippy Fact fluency (anti-shame) — a quick bright hummingbird kid who recalls a fact in a snap and helps you practice till it pops; a gentle glow, never a timer or a buzzer
What next? Pick a door
- More like this Make-Ten Pyramid Which two cards make ten? SevenPals Why does 7 come up most? PacePals How many steps to the park?
- A bit harder BarPals Can you draw the story as bars? BasketPals Roll again, or keep your hay? CarryPals How many tens, how many ones?
- Something different GlobePals Which city is farther from home? BeePals Can you spell the word you hear? Bug Hunt Where are the sleeping bugs hiding?