1. 5 times 8 is equal to ______________

2. 20 is 5 times ____________________

3. 73 x11 =  _______________________

4. Add the following numbers

a. 645 +235

b. 750 + 492

c. 308 + 390

5. Add the two digits and three digits smallest number.

6. Add four digits largest number with three digits largest number.