First you explain what the dividend, the divisor, and the approximately equals sign are. Then you tell the students that with estimated division, you always look for a number that is in the table of the divisor. Next you show how estimated division works step by step. Explain that you first look at the outcomes in the table. Look for which outcome is the closest to the divisor. For this you have to choose a number that is divisible by the divisor. You can also round the divisor to make a good estimated quotient. Unlike with estimated addition or subtraction, you can't round to any number. You need to choose a number that is divisible by the divisor. Show this step by step. You can also round to the nearest hundred. This is also possible, but you will be farther away from the exact answer. Discuss this with the students. Next the students practice estimated division on their own. After this, walk the students through the steps of solving a story problem with estimated division and have the students practice this on their own as well.
Check whether the students can estimate quotients by asking them the following question:
- How is estimated division different from estimated addition or subtraction?