What Does It Mean to Complete a Subtraction Sentence?
A subtraction sentence is like a math puzzle with missing pieces!
Sometimes we know the total and one part, and need to find the other part. For example, in "500 - ? = 200", we're trying to find what number subtracted from 500 gives us 200. It's like solving a mystery with numbers!
How to Find Missing Numbers
1️⃣ Look at what's missing - Is it the first number, second number, or answer?
2️⃣ Think about the relationship - Subtraction is the opposite of addition!
3️⃣ Check your answer - Put your number back in the sentence to see if it works
Let's Practice Together!
Example 1: Find the Missing Number
What number makes this subtraction sentence true?
7
2
5
-
3
?
=
4
2
1
725 - ? = 421
Example 2: Complete the Sentence
Which number completes this subtraction sentence?
?
-
1
5
6
=
2
4
7
? - 156 = 247
Parent Tips 🌟
- Use real-life examples: "If you had 500 marbles and gave away some, now you have 350. How many did you give away?" makes the concept tangible.
- Play subtraction bingo: Create bingo cards with subtraction problems where children need to find missing numbers.
- Break it down: For three-digit problems, encourage kids to subtract hundreds, then tens, then ones separately if they're struggling.