When adding multi-digit decimal numbers, what is the primary alignment rule for stacking the numbers?

• Align the leftmost digits

• Align the rightmost digits

• Align the decimal points

• Align the largest numbers on top

If a number place lacks a digit when performing decimal addition or subtraction, what is the recommended action?

• Leave the space blank

• Assume the digit is 1

• Place a zero in that position

• Shift the numbers to the left

After performing column-by-column addition or subtraction with decimal numbers, what crucial final step must be taken to ensure the correct answer?

• Round the result to the nearest whole number

• Move the decimal point two places to the left

• Bring a copy of the decimal point straight down into the answer line

• Multiply the result by 10