Money Math
How much is in the handful? Count the coins, then write it down.
For grown-ups
- How long: 10 to 15 minutes is plenty. Short and frequent beats long and occasional — the early-numeracy trials with the largest effects ran eight weeks or less.
- When they get one wrong: the page shows the working. Read it together rather than moving straight on. Feedback that explains is worth several times more than feedback that only marks right or wrong, and that gap is wider in maths than in any other subject.
- Not timed: thinking time is the point of a book. Let silences run.
- Print it too: doing the same problems on paper a few days later is worth more than doing twice as many today.
What this practises
Naming coins, counting a mixed handful, and writing amounts with $ and ¢.
No efficacy trial sits behind this activity and the site does not pretend otherwise. What the literature offers is descriptive and consistent: the size-versus-value confusion is the dominant early error, the fix is showing equivalence physically, coins should be met one at a time before being mixed, and counting a handful depends on prior skip-counting fluency. Those shape the ordering and the figures rather than supporting an effect size. The coverage argument is plain: money is 2.MD.C.8 and IM grade-2 Unit 6, and the catalogue had nothing on it at all — no penny, no nickel, no dime, no quarter.
- The underlying idea
- Coin value is arbitrary with respect to coin size, and children default to size. The four are always drawn at their real relative diameters so the picture cannot reinforce the error, and the strategy taught is sort-then-count from the highest value, which is what keeps a mixed handful tractable.
- Where this sits in Illustrative Mathematics
- 2nd grade Unit 6: Geometry, Time, and Money
- Sources
- Illustrative Mathematics / Kendall Hunt (2024) · Illustrative Mathematics (2024) all references →
Related measured skill: ALPACA · Early operations. What this means