.41+21.4+6.3+280= how do they get the answers

.41+21.4+6.3+280= how do they get the answers

.41+21.4+6.3+280= how do they get the answers

In decimal how do you get the answers

.41+21.4+6.3+280= how do they get the answers

Add them up

0.41 + 21.4 = 21.81

21.81 + 6.3 = 28.11

28.11 + 280 = 308.11


If you put them in columns (using zeroes to pad the left and the right)
000.41
021.40
006.30
280.00

1. Add the far right column: 1 + 0 + 0 + 0 = 1 Nothing to carry.
2. Add the next column to the left: 4 + 4 + 3 = 11. Keep the 1, carry the 1 to the left.
3. Add the first column to the left of the decimal point. Start with the 1 you carried: 1 + 0 + 1 + 6 = 8. Nothing to carry.
4. Add the next column to the left: 2 + 8 = 10. Keep the 0, carry the 1.
5. Start with the "carried" 1, add the leftmost column: 1 + 0 + 0 + 0 + 2 = 3

The final answer, 308.11

I'm not sure if this answers your question or not.