It is not a must to fast them consecutively, you should try to fast as many as you can.

If we miss the fast of the first day of Dhul hijjah, Can we start fasting on the 2nd day or 3rd or fast randomly whichever day we like in these nine days or is it must that we should start consecutively from day 1 and continue till the ninth day ?

Fasting | September 17, 2015 3:40 am
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she will fast single day of arafa n in Ramadan is 30 days which she cannot fast bcoz of her BP n sugar. She said I will fast one in Sha Allah. In fact I told her dat if she can fast one single day of arafa her sins will be wiped out of previous n next year, so she said yes I will try. she is 78 years
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In shaa Allah want to fast for the 9 firsts days of dhul al hijah to do sunnah but can I put another intention to complete my missed fast for ramadan?