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MathematicsElementary 4.8 · 9,600

Mental Math Tricks

Fast, friendly tricks for adding, doubling, and multiplying in your head — no paper needed.

Mr. Leo Fontaine, Numeracy Coach

Mr. Leo Fontaine

Numeracy Coach

Course progress0 / 3 lessons
1

Adding by Rounding

Round to a friendly number, then adjust.

6 min +40 XP2 quiz questions
2

Doubles & Near Doubles

Use doubles you know to find sums fast.

6 min +40 XP2 quiz questions
3

Times 10 and Times 11

Spot the patterns that make big products easy.

6 min +40 XP2 quiz questions

Common questions

Who is "Mental Math Tricks" for?

It is written for learners at Elementary level (Grades K–5), and for anyone older who wants a clear refresher on mathematics. Fast, friendly tricks for adding, doubling, and multiplying in your head — no paper needed. There is no application or entry test — you can start the first lesson straight away.

How long does the course take?

There are 3 lessons totalling 18 minutes of reading and quizzes, laid out over 2 units. You can move at your own pace — progress is saved as you go.

What do I need to know before starting?

No prior coursework is assumed. The course opens with "Adding & Doubling", covering round and adjust and doubles, so the foundations are built in rather than expected.

Is the course free?

Yes. Every course on Monster Class is completely free, with no credit card, trial period or paywall. Creating a free account simply saves your progress, XP and place on the leaderboard across devices.