1st grade counting by twos hidden pictures game - At the beginning students were taught how to count from 1 to 20, 20 to 30 and so on. Counting in that manner could also be considered as counting in ones. This means every number on the series is more or less than its neighbor by one. In this exercise, students will rather study how to count in twos whereby the numbers on the series will increase by two each time. For example, 2, 4, 6, 8�� Children will be presented with a series that is progressing in twos. They have to determine the missing number on the series if it progresses by twos. For example in the series above, the next number is 10. Hence the logic is that 2 was added to 8. It follows same for the next number after 10 will be 10 + 2 = 12 and so on. This is also an interactive math game whereby players have fun while reviewing.