Math practice for kids: numbers up to 10, 20 and 100

How to practice

• Start with addition up to 10, then move on to 20 and further – up to 100.
• In subtraction the answer is never negative, and division always comes out even.
• The “Correct” and “Mistakes” counters are kept between sessions; the “Start over” button resets them – for another child, for example.
• Ten to fifteen minutes a day are enough to make counting a habit.

What the trainer can do

• Four operations: addition, subtraction, multiplication and division. Multiplication is marked with an asterisk (*), division with a slash (/), as on a keyboard and a calculator.
• The largest number goes from 10 to 100 in steps of 10. In addition and subtraction neither number is larger, in multiplication neither factor, in division the divisor and the answer.
• Type the answer and check it with the button or the Enter key. The next task appears three seconds later.
• The trainer says “Correct” aloud or names the right answer, and a right answer brings a cat. The sound button above the counters turns the voice off, and the trainer remembers it.

Where to start and in what order

Children usually learn to count in this order:

1. Addition and subtraction up to 10 – for preschoolers of 5–6: number bonds, 3 + 4, 9 − 5.
2. Up to 20 – adding and subtracting across ten, usually in the first grade: 8 + 5, 14 − 6.
3. Up to 100 – two-digit numbers, usually in the second grade: 37 + 25, 80 − 46.
4. Times tables – choose multiplication and the largest number 10: every task comes from the times tables, from 0 × 0 to 10 × 10. Division with the same 10 is the tables backwards, for example 56 : 8.

Multiplication and division with a largest number above 10 give tasks like 47 × 86 that are worked out on paper. They are for older pupils or for adults who want to exercise their brain.

Frequently asked questions

Do I need to sign up?

No. The trainer is free and works right in the browser – on a computer, a tablet or a phone.

Is the score saved?

Yes, in the browser on this device – nothing is sent to the server, so another phone or another browser has a score of its own. But saving does not work everywhere: in incognito mode and when sites may not store data, the score is gone once the page is closed; clearing the browsing history erases it, and Safari on iPhone and iPad may delete it if the site is not opened for a long time.

What if my child makes many mistakes?

Lower the largest number and go back to the tasks that already went well. Mistakes are part of learning: the trainer shows the right answer at once and gives a new task a few seconds later.

Why is there no sound?

Check the sound button above the counters and the volume of the device. The trainer speaks with a voice built into the browser; a device without an English voice shows the result on the screen only.

Counting goes well? Move on to the clock trainer: counting in fives comes in handy there.