Write all whole numbers between 100 and 200 which do not change if the digits are written in reverse order.

How many 2-digit whole numbers are there between 5 and 92?

Fill in the blanks to make each of the following a true statement:

(i) 378 + 1024 = 1024 + ….

(ii) 337 + (528 + 1164) = (337 + ….) + 1164

(iii) (21 + 18) + …. = (21 + 13) + 18

(iv) 3056 + 0 = …. = 0 + 3056

Add the following numbers and check by reversing the order of addends:

(i) 3189 + 53885

(ii) 33789 + 50311