📄 2nd Grade Math: 3-Digit Addition and Subtraction Worksheet
📌 1. True / False
1. When you add 100 to 250, the result is 350.
2. Subtracting 1 from 400 results in 399.
3. Regrouping is only used in subtraction, not in addition.
4. The sum of two 3-digit numbers is always another 3-digit number.
5. When you subtract 10 from 567, the tens digit changes from 6 to 5.
✏️ 2. Fill in the Blanks
1. In the number 345, the digit 3 is in the place.
2. The answer to an addition problem is called the .
3. When we need more ones to subtract, we can from the tens place.
4. The answer to a subtraction problem is called the .
5. Adding zero to any number results in number.
🔗 3. Matching
« The total amount when two or more numbers are added together.
« The result of subtracting one number from another.
« Exchanging 10 of one place value for 1 of the next higher place value (e.g., 10 ones for 1 ten).
« The value of a digit based on its position in a number.
« The position of the digit that represents groups of one hundred.
✍️ 4. Short Answer Questions
1. Explain in your own words what 'regrouping' means when you are adding 3-digit numbers.
💡 Suggested Answer: Regrouping means when you have 10 or more in one place value (like 10 ones), you trade it for 1 in the next higher place value (like 1 ten). For example, 12 ones becomes 1 ten and 2 ones.
2. How is subtracting 3-digit numbers similar to subtracting 2-digit numbers?
💡 Suggested Answer: Subtracting 3-digit numbers is similar to subtracting 2-digit numbers because you still subtract the ones, then the tens, and then the hundreds. You might also need to regroup (borrow) from a higher place value if the bottom digit is larger than the top digit in a column, just like with 2-digit numbers.
🎯 5. Multiple Choice
1. What is the sum of 342 and 125?
2. Find the difference: \(578 - 234\)
3. Sara has 265 stickers. Her friend gave her 158 more stickers. How many stickers does Sara have now?
📝 6. Open-Ended Questions
1. A bakery made 375 cupcakes in the morning and 248 cupcakes in the afternoon. How many cupcakes did the bakery make in total?
💡 Solution Steps:
To find the total number of cupcakes, we need to add the cupcakes made in the morning and in the afternoon.\
Number of cupcakes in the morning: 375\
Number of cupcakes in the afternoon: 248\
\
Add the numbers using place value:\
\( \begin{array}{r}\
375 \\ + 248 \\ \
\end{array} \)\
\
1. Add the ones place: \(5 + 8 = 13\). Write down 3 in the ones place and regroup 1 ten to the tens place.\
2. Add the tens place: \(7 + 4 + 1 \text{ (regrouped ten)} = 12\). Write down 2 in the tens place and regroup 1 hundred to the hundreds place.\
3. Add the hundreds place: \(3 + 2 + 1 \text{ (regrouped hundred)} = 6\). Write down 6 in the hundreds place.\
\
So, \(375 + 248 = 623\).\
The bakery made 623 cupcakes in total.
2. There were 536 books in the library. During the week, 179 books were borrowed. How many books are left in the library?
💡 Solution Steps:
To find out how many books are left, we need to subtract the borrowed books from the total number of books.\
Total books: 536\
Books borrowed: 179\
\
Subtract the numbers using place value:\
\( \begin{array}{r}\
536 \\ - 179 \\ \
\end{array} \)\
\
1. Subtract the ones place: We cannot subtract 9 from 6. We need to regroup. Take 1 ten from the tens place (3 tens becomes 2 tens) and add 10 ones to the ones place (6 ones becomes 16 ones). Now, \(16 - 9 = 7\). Write down 7 in the ones place.\
2. Subtract the tens place: We cannot subtract 7 from 2 (since 3 tens became 2 tens). We need to regroup. Take 1 hundred from the hundreds place (5 hundreds becomes 4 hundreds) and add 10 tens to the tens place (2 tens becomes 12 tens). Now, \(12 - 7 = 5\). Write down 5 in the tens place.\
3. Subtract the hundreds place: \(4 - 1 = 3\). Write down 3 in the hundreds place.\
\
So, \(536 - 179 = 357\).\
There are 357 books left in the library.
3. A school has 415 students in the first three grades. If 208 of these students are in 1st and 2nd grade, how many students are in 3rd grade?
💡 Solution Steps:
To find the number of students in 3rd grade, we need to subtract the number of students in 1st and 2nd grade from the total number of students in the first three grades.\
Total students in first three grades: 415\
Students in 1st and 2nd grade: 208\
\
Subtract the numbers using place value:\
\( \begin{array}{r}\
415 \\ - 208 \\ \
\end{array} \)\
\
1. Subtract the ones place: We cannot subtract 8 from 5. We need to regroup. Take 1 ten from the tens place (1 ten becomes 0 tens) and add 10 ones to the ones place (5 ones becomes 15 ones). Now, \(15 - 8 = 7\). Write down 7 in the ones place.\
2. Subtract the tens place: \(0 - 0 = 0\). Write down 0 in the tens place.\
3. Subtract the hundreds place: \(4 - 2 = 2\). Write down 2 in the hundreds place.\
\
So, \(415 - 208 = 207\).\
There are 207 students in 3rd grade.
Name Surname: .................................. Date: .... / .... / 202...
3-Digit Addition and Subtraction Worksheet
SCORE
A. True (T) / False (F)
( .... )
When you add 100 to 250, the result is 350.
( .... )
Subtracting 1 from 400 results in 399.
( .... )
Regrouping is only used in subtraction, not in addition.
( .... )
The sum of two 3-digit numbers is always another 3-digit number.
( .... )
When you subtract 10 from 567, the tens digit changes from 6 to 5.
B. Fill in the Blanks
1)
In the number 345, the digit 3 is in the .................... place.
2)
The answer to an addition problem is called the .....................
3)
When we need more ones to subtract, we can .................... from the tens place.
4)
The answer to a subtraction problem is called the .....................
5)
Adding zero to any number results in .................... number.
C. Matching Concepts
( .... )
The total amount when two or more numbers are added together.
- Hundreds Place
( .... )
The result of subtracting one number from another.
- Sum
( .... )
Exchanging 10 of one place value for 1 of the next higher place value (e.g., 10 ones for 1 ten).
- Difference
( .... )
The value of a digit based on its position in a number.
- Regrouping
( .... )
The position of the digit that represents groups of one hundred.
- Place Value
D. Short Answer Questions
1)
Explain in your own words what 'regrouping' means when you are adding 3-digit numbers.
2)
How is subtracting 3-digit numbers similar to subtracting 2-digit numbers?
E. Multiple Choice Questions
1)
What is the sum of 342 and 125?
A) 457B) 467C) 567D) 476
2)
Find the difference: \(578 - 234\)
A) 344B) 342C) 354D) 348
3)
Sara has 265 stickers. Her friend gave her 158 more stickers. How many stickers does Sara have now?
A) 413B) 423C) 323D) 313
F. Open-Ended Questions
1)
A bakery made 375 cupcakes in the morning and 248 cupcakes in the afternoon. How many cupcakes did the bakery make in total?
2)
There were 536 books in the library. During the week, 179 books were borrowed. How many books are left in the library?
3)
A school has 415 students in the first three grades. If 208 of these students are in 1st and 2nd grade, how many students are in 3rd grade?