1. The problem asks to round the number 64.9963 to (a) 2 decimal places, and (b) the nearest 10. 2. (a) Rounding to 2 decimal places means we keep two digits after the decimal point and round based on the third digit. The number is 64.9963. The first two decimals are 9 and 9, the third decimal is 6. Since 6 is greater than or equal to 5, we round the second decimal up by 1. However, since the second decimal is 9, rounding up increases it to 10, which causes a carryover. So, 64.9963 rounded to 2 decimals becomes 65.00. 3. (b) Rounding to the nearest 10 means looking at the units digit and deciding if we round down to 60 or up to 70. The number is 64.9963. The units digit is 4 (in the number 64), which is less than 5. So, we round down to 60. Final answers: (a) 65.00 (b) 60