We can estimate some lengths and distances using approximate values ​​for measurements. For example, a meter is roughly the length from the shoulder to the fingertips of an adult. A meter is also roughly the distance of a large step or jump. You must have seen the cloth merchant measuring the fabric with his arms.

While guessing length and distance can be useful, we often need to know exactly how long something is. In order to measure accurately, we use various measuring devices such as a scale, tape measure, etc.

Let’s learn to estimate with the following activity.

Step I: Draw your hand on paper and measure the length of your hand in inches. Let’s take 10 cm.

Step II: Now take your notebook and estimate the length by hand.

Step III: Now measure the actual length of the notebook with the ruler.

Let’s draw a line segment of 5 cm without using a ruler. Now measure the line and note the actual length. Note the estimated length and the actual length.

Collect 5 objects from your environment and enter the estimated length and the actual length in the table provided. One was done for you.

 object Write the unit (m or cm) Estimated length Actual length How good was your assessment? Length of a notebook cm 25 cm 27 cm 2 cm short __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________