This is a collection of lessons created to address the 4.MD.1 common core standard for fourth grade. The lessons include:-Single-step measurement conversion tables-The Big G (visual for gallon guy conversions)-Metric units vs. customary units-Millimeters, centimeters, meters, kilometers, grams, kilograms, milliliters, liters, gallons, quarts, pints, cups, seconds, minutes, hours, inches, feet, yards, miles, pounds, ounces-Single-step measurement conversion word problems-Multi-step measurement co