As you move from one place value to the next, from the right to left, you are increasing the value of the place value by a factor of **. In other words, thousands are ten times bigger than the **; the ** are ten times bigger than the ten millions. This occurred because when people first began to count, they used their ** What should be written in it **​

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.