Subtraction

There are no negative results at any level

Level 1

Numbers from 0 to 9

Level 2

Minuend from 1 to 20, subtrahend from 0 to 9

Level 3

Numbers from 0 to 20

Level 4

Minuend from 11 to 99, subtrahend from 0 to 20

Level 5

Numbers from 11 to 99

Level 6

Minuend from 101 to 999, subtrahend from 11 to 99

Level 7

Numbers from 101 to 999

Multiplication

Level 1

Numbers from 0 to 5

Level 2

One number from 0 to 5, the other from 1 to 10

Level 3

Numbers from 0 to 10

Level 4

One number from 0 to 10, the other from 2 to 20

Level 5

Numbers from 2 to 20

Level 6

One number from 2 to 20, the other from 3 to 100

Level 7

Numbers from 3 to 100

Division

There are no remainders at any level

Level 1

Dividend from 0 to 25, divisor from 1 to 5

Level 2

Dividend from 0 to 50, divisor from 1 to 5

Level 3

Dividend from 0 to 100, divisor from 1 to 10

Level 4

Dividend from 0 to 200, divisor from 1 to 10

Level 5

Dividend from 4 to 400, divisor from 2 to 20

Level 6

Dividend from 6 to 2000, divisor from 3 to 20

Level 7

Dividend from 9 to 10,000 and divisor from 3 to 100

Addition & Subtraction

Level 1

Numbers from 0 to 9

Level 2

One number from 0 to 9, the other from 0 to 20

Level 3

Numbers from 0 to 20

Level 4

One number from 0 to 20, the other from 11 to 99

Level 5

Numbers from 11 to 99

Level 6

One number from 11 to 99, the other from 101 to 999

Level 7

Numbers from 101 to 999