Select all the addition problems in which you annex zeros.

Answer:
A, B and D
Explanation:
(a)1.7+9+6.41
We annex zeros as follows:
[tex]\text{1}.70+9.00+6.41[/tex](b)0.03+12
We annex zeros as follows:
[tex]0.03+12.00[/tex](c)19.3+0.3
Since there is 1 digit after the decimal point in each there is no need to annex zeros.
(d)1+2.46+17.44
We annex zeros as follows:
[tex]1.00+2.46+17.44[/tex](e)0.68+12.44
Since there are 2 digits after the decimal point in each there is no need to annex zeros.
A, B and D are the correct choices.