Counting by 2's, 5's, 10's to 100
Numbers and Counting, and more...

 1 EASY What comes next: 10, 20, 30, 40, 50...

 2 EASY What comes next: 2, 4, 6...

 3 EASY What comes next: 5, 10, 15, 20, 25...

 4 MEDIUM Manny is counting by 5's and starts on the number 65. What should his next two numbers be?

 5 MEDIUM John and Gobin each count to 100 starting from 0. John counts by 2's and Gobin counts by 5's. If they count at the same speed, who will reach 100 first? JohnGobinNeither will reach 100They will reach 100 at the same timeNone of the above

 6 MEDIUM Viraj is counting by 10's. If he starts at 30 and counts to 70, how many numbers does he say? 404541None of the above

 7 HARD Peter and Lea are having a counting race. Peter starts at 100 and counts down by 10 until 0. Lea starts at 0 and counts up by 10 until she reaches 100. If they both count at the same speed, who will win the race? PeterLeaThey would tieNeither would finish the raceNone of the above

 8 HARD Vinit is counting by 5's. If he starts at 20 and counts to 50, how many numbers does he say? 303176None of the above

 9 HARD When you count by 2's from 2 to 100, how many numbers will you count in total? 10050255149

 10 HARD Perplexed Pat is trying to count by 2's starting from 2. He says the following: "2, 12, 22, 32....". What is wrong with his counting?