Lesson Shuffle: Shuffle, Pick, Grow
Instructional DeliveryCard B2

Shuffle Practice

Shuffle the practice deck

10–15 min5-min prepStrong

The move

Mix a few older problems into today’s practice, in random order, so students have to figure out which strategy each problem needs before they solve it.

See how it works

Blocked
AAAAAABBBB
You know the method before you read
Shuffled
ABACBACABC
Students must choose the strategy each time

A Today’s skill B Older skill 1 C Older skill 2

Same problems, different order. Mixing forces students to pick the strategy, not just run it.

At a glance

Time in class
10–15 minutes. It replaces practice time you already use, so it adds no time.
Prep
5 minutes: pull 2–3 problems from earlier units.
Materials
The practice set you were already going to use.
Grouping
Individual, then pairs to check.
Use it when
Students have had some focused practice on today’s skill and are ready to apply it.

Why it works

When every problem on a page is the same type, students know the method before they read the problem, so they never practice choosing it. Mixing problem types (researchers call this interleaving) makes students identify the right strategy each time, which is what tests and real life ask of them. It feels harder in the moment, and that extra effort is what makes the learning last.

Step by step

In class: about 10–14 min

  1. 4Launch30 seconds
  2. 5Solve8–10 minutes
  3. 6Check strategies first2–3 minutes

Before class: Add 2–3 older problems

  1. Start with today’s setNo extra timeTake the 6–8 practice problems you already planned.
  2. Add 2–3 older problems5 minutes, before classPick problems from earlier units that look similar to today’s but need a different strategy.
  3. Shuffle the orderMix the older problems in among the new ones, not all at the end.
  4. Launch30 seconds“Heads up: these problems are mixed. Before you solve each one, write the strategy you’ll use in the margin.”
  5. Solve8–10 minutesStudents work on their own.
  6. Check strategies first2–3 minutes“Compare with a partner. Did you pick the same strategy for each problem? Where you disagree, convince each other before you check answers.”

See it in action

Mix addition and subtraction word problems so students must decide which operation each story needs.

Watch out for

Level up

Make it work for everyone

Tech option

Google Forms and most quiz platforms can shuffle question order automatically. Build one bank with old and new questions and turn on shuffle.

Resources

Reflect

Which strategies did students confuse most often? That pair is your next mini-lesson.

Evidence

Strong

Rohrer, D., & Taylor, K. (2007). The shuffling of mathematics problems improves learning. Instructional Science, 35(6), 481–498. Students who practiced with mixed problem types did better on a later test than students who practiced one type at a time.

Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students’ learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58. A review of ten study techniques that includes interleaved practice.

Find the research: Rohrer (2007) · Dunlosky (2013)