Mathematics
Grade 1
15 min
Subtracting 0
Subtracting 0
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1
Introduction & Learning Objectives
Learning Objectives
Identify that subtracting zero means taking away nothing.
Solve subtraction problems with zero for numbers up to 20.
Explain in their own words why a number stays the same when zero is subtracted.
Model subtracting zero by drawing pictures or using objects.
Write a number sentence for a subtraction story that involves zero.
Recognize the pattern that any number minus zero is that same number.
You have 5 yummy cookies. ๐ช You decide to eat 0 of them. How many cookies do you still have?
Today, we will learn a super easy subtraction trick! We will learn all about subtracting the number zero. This trick makes you a subtraction superstar! ๐
Real-World Applications
You have 8 toy cars and none roll away.
You see 3 birds on a fence and 0 fly away.
You...
2
Key Concepts & Vocabulary
TermDefinitionExample
SubtractSubtract means to take something away. ๐If you have 4 balls and you subtract 1, you have 3 left.
Zero (0)Zero is a special number that means 'nothing' or 'none'.If you have 0 puppies, you have no puppies. ๐ถ
Minus Sign (-)This is the minus sign. It tells us to subtract.The problem 5 - 2 has a minus sign.
Equals Sign (=)This is the equals sign. It means 'is the same as'.In 3 - 1 = 2, the answer is the same as 2.
Number SentenceA math problem written with numbers and signs. โ๏ธ7 - 0 = 7 is a number sentence.
DifferenceThe difference is the answer to a subtraction problem.In 9 - 2 = 7, the difference is 7.
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Core Formulas
The Zero Subtraction Rule
n - 0 = n
Use this rule when you see a number minus zero. The answer is always the number you started with!
The Picture Rule
Draw and Don't Cross Out
Draw the first number. When you subtract 0, you don't cross anything out. Just count what you drew!
4 more steps in this tutorial
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Challenging
I am thinking of a number. I subtract 0 from it. Then I add 4 to the result. My final answer is 14. What number was I thinking of at the start?
A.10
B.14
C.18
D.4
Challenging
A number sentence is missing a sign: 19 ___ 0 = 19. Which two signs could go in the blank to make it true?
A.+ and -
B.- and =
C.+ and x
D.- and รท
Challenging
Which of these problems has the GREATEST answer?
A.20 - 1
B.19 - 0
C.18 + 1
D.20 - 0
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