Section 1
Relating Division to Finding a Missing Factor
Property
Solving a division problem, such as , is the same as finding the unknown factor in the related multiplication equation, .
The quotient of the division is the unknown factor.
In this Grade 4 enVision Mathematics lesson from Chapter 5, students learn how to estimate quotients using compatible numbers and multiplication when dividing 3-digit dividends by 1-digit numbers. Students practice replacing difficult numbers with nearby compatible numbers to make mental math easier, such as replacing 700 ÷ 9 with 720 ÷ 9 because 720 is divisible by 9. The lesson builds number sense by applying basic multiplication facts to check whether estimated quotients are reasonable in real-world contexts.
Section 1
Relating Division to Finding a Missing Factor
Solving a division problem, such as , is the same as finding the unknown factor in the related multiplication equation, .
The quotient of the division is the unknown factor.
Section 2
Choosing Compatible Numbers for Estimation
Compatible numbers are numbers that are easy to compute mentally. When estimating quotients, replace the dividend with a nearby number that is a multiple of the divisor, which is often more effective than using standard rounding rules.
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Section 1
Relating Division to Finding a Missing Factor
Solving a division problem, such as , is the same as finding the unknown factor in the related multiplication equation, .
The quotient of the division is the unknown factor.
Section 2
Choosing Compatible Numbers for Estimation
Compatible numbers are numbers that are easy to compute mentally. When estimating quotients, replace the dividend with a nearby number that is a multiple of the divisor, which is often more effective than using standard rounding rules.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter