Question

Jane used 73,678 blocks of dark chocolate and 12,453 blocks of milk chocolate to make the floors of the palace. Calculate the total number of blocks used.

• A. 86,131
• B. 86,132
• C. 86,133
• D. 86,111

Answer 1

The correct option is A 86,131

Blocks of dark chocolate used = 73,678
Blocks of milk chocolate used = 12,453
While adding two numbers, the digits at ones, tens, hundreds, thousands, and ten thousands places of a number should be added to the corresponding digits at ones, tens, hundreds, thousands, and ten thousands places of another number.

Here we have to do regrouping.
- The addition of the digits at ones place (11 ones) is regrouped as 1 ten and 1 ones.
- The addition of the digits at tens place (13 tens) is regrouped as 1 hundreds and 3 tens. The addition of the digits at hundreds place (11 hundreds) is regrouped as 1 thousands and 1 hundreds.
- In the thousands place, we have 1 + 3 + 2 = 6 thousands.
- Add all other digits in the number.

Thus, the total number of blocks used is 86,131.