Reflection: Connection to Prior Knowledge Estimating Quotients - Section 4: Closure


The multiplication chart was a great tool to help with this activity.  The students were surprised that I let them use a multiplication chart because they know that I expect them to learn their multiplication facts.  However, I felt that for this particular activity it would be an asset.  The students were able to get a visual of what multiplication facts could be used to identify the compatible number for the division problems.

The multiplication chart was important, in this lesson, for the students who did not know their facts.  Finding compatible numbers is not a simple skill.  Therefore, these students needed the chart.  The students used the chart in the following way:

For example, in the problem 759 divided by 9

The students underlined the first two digits in 759.  So, the students underlined 75.  The students used the multiplication chart to find their 9's.  Under the 9's, the students looked for a number close to 75.  9 x 8 = 72 and 9 x 9 = 81.  Because 72 is closer than 81, the students used 72 for their compatible number.  The students knew to add a 0 to get 720 because they were working with a 3 digit number (a multiple of ten).  The students then divided 720 divided by 9 to get 80.

  Multiplication Chart
  Connection to Prior Knowledge: Multiplication Chart
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Estimating Quotients

Unit 12: Multiplying and Dividing
Lesson 16 of 23

Objective: SWBAT use compatible numbers and rounding to estimate quotients.

Big Idea: You can substitute numbers that can help make estimating division problems easier.

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7 teachers like this lesson
Math, Number Sense and Operations, Operations , division, estimating quotients
  50 minutes
estimating quotients
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