The deficit for FY18 is 1.27 trillion.
From the CBO website:
Monthly Budget Review for August 2018
The federal budget deficit was $895 billion for the first 11 months of fiscal year 2018, the Congressional Budget Office estimates, $222 billion more than the shortfall recorded during the same period last year. Revenues were 1 percent higher than in the same period in fiscal year 2017, but outlays rose by about 7 percent.
As was the case last year, this year’s outlays were affected by shifts in the timing of certain payments that otherwise would have been due on a weekend or a holiday. If not for those shifts, the increase in the deficit would have been smaller: The deficit for the 11-month period would have been $154 billion larger than last year’s amount. Excluding the effects of those timing shifts, the increase in outlays was 4.7 percent, and about one-quarter of the increase was for interest on the public debt.
https://www.cbo.gov/system/files?file=2018-09/54442-MBR.pdf
Sure doesn't look like a 91.2% increase to me. So much for your "math skills". Oh, the CBO must be lying, right?
Let's try this one more time. From the Treasury Dept...
Debt to the Penny (Daily History Search Application)
FY-18 started on 1 Oct 2017. On that date the total Fed debt was $20,244,900,016,053
FY-18 ended on 30 Sept 2018. On that date the total Fed debt was $21,516,058,183,180
That is a total difference of $1,271,158,167,127. That is what the deficit was for FY18. This is not an estimate like the CBO is using, these are exact figures.
The total deficit for FY17 was $671,455,302,117. That is a growth of the deficit in one year of $599,702,865,010.
Which actually is only an 89% growth when you take out the rounding for each year.
So, you are correct, using rounded numbers made my math off by 2%.
So, I will admit I was mistaken, the change in the deficit was not 91.2% it was 89.3%.
Either way, that is not a small change.