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เนื้อหาย่อ : times it is important to know how long, or how hot, or how something is. If you decide to walk to a friend's house, but don't know how far away it is, you may be late. If you make a cake, but don't mea- sure the flour, the cake may not be good. HAPPY BLRTHDAD People all over the world use the metric system to measure. In the metric system, each unit is 10 or 100 or 1000 times as big as some other unit. It is easy to multiply by tens, so the metric system is easy to use. 1 millimeter 1 centimeter =10 millimeters 1 meter = 100 centimeters 1 Kilometer = 1000 meters In this book you will learn to make good measurements. You will mea- sure many different things, like how strong you are and how fast plants grow. Let's get started!