These cards can be printed, laminated (if you want), and given to each student. These cards help give a hands on experience for students when multiplying and dividing by multiples of 10. These cards then also help when applying that concept to the conversion of the metric system. The prefix cards can be placed as a table in front of them. Using the saying King Henry Doesn't Usually Drink Chocolate Milk, the students place kilo-, hecto-, etc. in the correct order. Students must change out the unit depending on the unit of measurement. Then students build the measurement, for example 5.3 cg, with the number cards. Then, students figure out how many place values they are converting to. For example, they would figure out that they are converting from cg to g so that would be 10 to the power of 2 because it is two places away. They can then select the 10 to the power of 2 card. After that, they determine which direction the conversion is happening and place the arrow to prove it. If they point it left, they select the divide left card. If they point the arrow to the right, they select the multiplying right card. Then they covert by moving the decimal to the right or left however many times they chose (their power of 10 card). If there is no decimal in the number, I taught them to place the decimal after the ones place. If they move the decimal and there is no digit, then they fill that place value with a zero. These cards help make conversion much more concrete.