0.05 × 208 =? 2.75 × 2.2 =? 0.049 × 45 = (two decimal places can be reserved) This is a reward for the money! No answer, no answer!

0.05 × 208 =? 2.75 × 2.2 =? 0.049 × 45 = (two decimal places can be reserved) This is a reward for the money! No answer, no answer!

ten point four
six point one
two point two

How much is 1.991? Keep two decimal places
2.999 is about two decimal places

1.991 is about 1.99
2.999 is about 3.00

Keep 4.1 to two decimal places, write about or equal to
The approximate value is equal to the exact value. Should we write approximately equal or equal?

The approximate value is equal to the exact value, which is equal to