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Ages 8–12 · Grades 3–7 · 16 levels

Shardline Express

Ride the Shardline Express and rebuild a broken sky-railway, one exact fraction at a time. Find fractions on the number line, compare and order them, spot equivalent fractions, work with mixed numbers, add and subtract fractions, find a fraction of an amount and turn fractions into decimals. 16 levels for ages 8–12.

  • Fractions on a number line
  • Comparing fractions
  • Adding & subtracting fractions
Shardline Express cover art

Levels

01 · Split SignalPlay
02 · Smallest Slice FirstLocked

A free account unlocks levels 3–4

Create a free account
03 · The First SpanFree account
04 · Thirds and SixthsFree account

A subscription unlocks levels 5–16

Try every level free for 30 days
05 · The Halfway MarkerSubscription
06 · Same Top, Same BottomSubscription
07 · MirrorplateSubscription
08 · Station OrderSubscription
09 · Past Station OneSubscription
10 · Whole Cars, Spare SeatsSubscription
11 · Same-Size PiecesSubscription
12 · Over or Under OneSubscription
13 · Different-Size PiecesSubscription
14 · Cargo SharesSubscription
15 · The Decimal BoardSubscription
16 · TerminusSubscription

How to play

  1. Pick an unlocked span on the rail line above. Dispatcher Kesh briefs you, then a short lesson shows the idea with a picture.
  2. Answer each challenge before the timer runs out: pick the right fraction, tap its stop on the number line, sort fractions into groups, or put them in order.
  3. Every answer comes with an explanation, right or wrong, so a mistake still teaches you something.
  4. Score 60% or higher to unlock the next level.
  5. Levels 1⁠–⁠2 are free with no account. A free account also unlocks levels 3⁠–⁠4.
  6. A small monthly subscription unlocks every remaining level.

Questions and answers

What age is Shardline Express for?

Ages 8 to 12, about grades 3 to 7. It starts with what a fraction is and ends with adding fractions that have different bottom numbers and turning fractions into decimals.

Which fraction skills does it cover?

Unit fractions, fractions on a number line, comparing and ordering fractions, equivalent fractions, mixed numbers, adding and subtracting fractions, finding a fraction of an amount, and writing fractions as decimals.

Why does the game use a number line so much?

Research on how children learn fractions recommends the number line as the main picture. It shows that a fraction is a number with a size, and that 1/2 and 4/8 are the same point.

Does it explain mistakes?

Yes. The wrong answers are the mistakes children really make, such as 1/2 + 1/3 = 2/5, and every answer is followed by a short explanation of the right method.