Tally Marks

In a classroom, some chalks are on the table shown in the picture below. Observe the picture and make a tally mark on it.

1. Find the total number of chalks.
2. Find the difference between the blue and green colour chalk.

1. Total number of chalks
   = 4 + 5 + 7 + 3 + 10
   = 29
2. the difference between the blue and green colour chalk
   = 10 – 4
   = 6