4-2+Figures+&+Precision

How many significant figures in the following numbers?
 * __Worksheet__ **
 * 1) 3423.34 - 6
 * 2) 2304.3 - 5
 * 3) 2050 - 3
 * 4) .0342 - 3
 * 5) 3434.34340 - 9
 * 6) 4 - 1
 * 7) 400 - 1
 * 8) .4 - 1
 * 9) .40 - 2
 * 10) .400 - 3
 * 11) 10000000000 - 1
 * 12) 1 - 1
 * 13) 1.00 -3
 * 14) 304050607 - 9
 * 15) 99 - 2
 * 16) number of doors in this room - 106
 * 17) number of glass cabinets in this room - 22
 * 18) number of drawers in this room - 34
 * 19) number of chairs and stools in this room - 35
 * 20) number of people cooler than Mr. Bair (hint the answer is zero, but not according to his wife =)) - 1 person id cooler than you and that is me :) im awseome cuz i can sing and i have white hair and blue eyes hahaha but you are very close to my coolness level =D

5 students were observed doing jumping jacks over 4 consecutive trials. They had 30 seconds for each trial.
 * __Precision__ **
 * 1) Determine which student was the most precise. Precision is determined by subtracting the largest number from the smallest number for that student. the smallest difference is the most precise. - The most precise student was Phillip
 * ||  |||||||| Trial ||
 * ||  || 1 || 2 || 3 || 4 ||
 * || Tom || 25 || 14 || 7 || 2 ||
 * || Jose || 1 || 2 || 15 || 9 ||
 * || Phillip || 4 || 5 || 6 || 5 ||
 * || SpongeBob || 3 || 8 || 12 || 15 ||
 * || Ricky || 5 || 34 || 15 || 2 ||
 * 2) Conduct a similar experiment over 4 trials. Make a table on your page 6 columns by 2 rows (or more if you have a partner), or copy the one below
 * Name || Trial1 || Trial2 || Trial3 || Trial4 || Precision(largest-smallest) ||
 * 3) Compare your results with other students. Who had the most precise results?
 * my leg has been killing me for the whole week this week because my brother beat me up on Labor Day =(( i promise im not lying either i wouldnt do that to a teacher of ur awesomeness.
 * 3) Compare your results with other students. Who had the most precise results?
 * my leg has been killing me for the whole week this week because my brother beat me up on Labor Day =(( i promise im not lying either i wouldnt do that to a teacher of ur awesomeness.