Mathematics
Grade 6
15 min
Complete the subtraction sentence - up to 18
Complete the subtraction sentence - up to 18
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1
Introduction & Learning Objectives
Learning Objectives
Identify the minuend, subtrahend, and difference in any given subtraction sentence.
Use inverse operations (addition) to find a missing minuend in a subtraction sentence up to 18.
Use inverse operations (subtraction) to find a missing subtrahend in a subtraction sentence up to 18.
Accurately calculate the difference when the minuend and subtrahend are given for numbers up to 18.
Solve for any missing number in a subtraction sentence involving numbers up to 18.
Check the accuracy of their solutions by substituting the found value back into the original sentence.
Ever wonder how detectives solve mysteries? 🕵️♀️ Just like them, we can use clues to find missing numbers in math problems!
In this lesson, we'll become math detectives to complete subtracti...
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Key Concepts & Vocabulary
TermDefinitionExample
Subtraction SentenceA mathematical statement that shows one number being taken away from another, resulting in a difference. It typically includes an equals sign.15 - 7 = 8 is a subtraction sentence.
MinuendThe first number in a subtraction sentence, from which another number is subtracted. It is the total or the starting amount.In the sentence 12 - 5 = 7, the minuend is 12.
SubtrahendThe second number in a subtraction sentence, which is being subtracted from the minuend. It is the amount being taken away.In the sentence 12 - 5 = 7, the subtrahend is 5.
DifferenceThe result or answer obtained when one number is subtracted from another. It tells us how much is left or the gap between two numbers.In the sentence 12 - 5 = 7, the difference is 7.
Inverse OperationsOperat...
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Core Formulas
Finding the Minuend
$$\text{Minuend} = \text{Difference} + \text{Subtrahend}$$
If you know the subtrahend and the difference, you can find the original minuend by adding them together. This is because addition is the inverse of subtraction.
Finding the Subtrahend
$$\text{Subtrahend} = \text{Minuend} - \text{Difference}$$
If you know the minuend and the difference, you can find the subtrahend by subtracting the difference from the minuend. This shows how much was taken away.
Finding the Difference
$$\text{Difference} = \text{Minuend} - \text{Subtrahend}$$
To find the result of a subtraction sentence, simply subtract the subtrahend from the minuend.
5 more steps in this tutorial
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Challenging
In the general subtraction sentence M - S = D, where M is the minuend, S is the subtrahend, and D is the difference, which equation must be used to find S if M and D are known?
A.S = M - D
B.S = M + D
C.S = D - M
D.S = M * D
Challenging
A student is told the difference in a subtraction problem is 8 and the subtrahend is 9. They incorrectly write the sentence as 9 - ? = 8. What is their conceptual error?
A.They used the wrong numbers.
B.They confused the minuend and the subtrahend.
C.They should have used an addition sign.
D.They calculated the missing number incorrectly.
Challenging
In the equation ? - a = b, if 'a' and 'b' are both positive whole numbers, what must be true about the missing number (the minuend)?
A.It must be smaller than 'a'.
B.It must be smaller than 'b'.
C.It must be larger than both 'a' and 'b'.
D.It must be between 'a' and 'b'.
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