This website has a nice explanation of the metric units for length, mass, and capacity. Check it out if you need a quick review.
Help save the swimmer. Read the distance and move the boat to help save the swimmer.
Review length, mass and capacity with this website. Just be careful, you have to spell the units very carefully in orger to get credit for a correct answer.
Fill the cylinder and practice reading the scale. You can change the scale and the gradations if you wish. If you overfill, you can empty some from the bottom of the cylinder.
Try this FunBrain activity called "Measure it" to practice measuring length. You can choose different levels of difficulty. Click on the centimetre option when you play.
Use this website to explore area. You can choose between a square grid or geoboard template.
Explore area and perimeter with these sites from Interactivate.
Everthing you might want to know about perimeter and area.