I can use place value again. The places are 10,000’s, 1000’s, 100’s, 10’s, 1’s there’s the decimal point 10th’s and 100th. So 850 multiplied by 100 you move the digits two places to ...

Children begin to understand number place value by age 3—much earlier than previously believed, according to a new study in Child Development— and they may be ready for more substantive math ...