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There are infinitely many possible additions:

10+11, 9+12, 8+13, 7+14, ....

and then

10.5+10.5, 10.4+10.6, 10.3+10.7, 10.2+10.8, ....

and then 2 digit

10.49 + 10.51, 10.48+10.52, ...

and 3 digit, 4 digit, ... infinitely many digits.

Next, you can look at multiplication:

1x21, 2x10.5, 3x7, and so on

and then 0.1x210, 0.2*105, 0.3*70 and so on

and then 2 digit decimals fractions, and then 3 digit, 4 digit, and so on, and on.

And I have not even started on 3 or more numbers, or powers and other mathematical functions.

More answers

There are several ways to make 21, such as adding 10 and 11, adding 15 and 6, or multiplying 3 and 7. Another way is subtracting 1 from 22.

Q: What ways to make 21?

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Related questions

There are many ways. One such is 21, 30, 45, 69, 78

In a straight line, 21! = 51,090,942,171,709,400,000 or approximately 51 quintillion.

Not Legally.

There are numerous ways.

An infinite number of ways

the same ways you do

4. Ways

3 over 7 x 21 over 1 and 21 over 1 x 3 over 7

how different ways can you make 50 cents in change

There are 15 ways to make 7 using 3 dice.

There are 36 different ways to make 50 cents out of nickels, dimes and pennies.

I think 4 different ways