Eureka Math Module 2, Topic C, Grade 6 - Weebly
Eureka Math Module 2, Topic C, Grade 6
Module 2, Topic C ? Dividing Decimals
Lesson 12 ? Estimation & Dividing Whole Numbers
? Objective:
? I can use estimation and the standard algorithm to divide
decimals.
? Guiding Question:
? What is the benefit of estimating before dividing?
Lesson 12 ? Estimation and Dividing Whole Numbers
Estimating Whole Numbers when Dividing:
Use estimation to determine the reasonable
answer in a multi ? digit division problem.
EX: 4752 ? 12
Step 1: Round to compatible numbers
4700 5000
12 10
5000 ? 10
Step 2: Round to a one ? digit arithmetic fact.
500 ? 1
Step 3: Divide the compatible numbers
500
1 500
Lesson 13 ? Dividing with Standard Algorithm
? Objective:
? I can divide multi ? digit numbers using the standard algorithm. ? I can justify my answer using estimation.
? Guiding Question:
? How can estimation be helpful when dividing large numbers?
Lesson 13 ? Dividing with the Standard Algorithm
Dividing Multi ? Digit Numbers:
3,688 19 70,072
-57 130 -114
167 -152
152 -152
0
EX: 70,072 ? 19
Estimate:
70,000
?
20
=
,
=
,
=
,
Step 1: Set the problem up in long division form. 19 70, 072
Step 2: Use the estimated answer to determine the place value of the actual answer.
(since the estimated answer was in the thousands place, the answer should start in the thousands place.)
Step 3: Use the estimated answer to determine the starting point. (Since the estimated answer was 3,500 we can see if 19 can be divided into 70 at least 3 times.)
Step 4: Continue dividing.
Step 5: Verify that the actual answer is close to the estimated answer.
Estimate = 3,500
Actual ? 3,688
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