When preparing to subtract $81 - 25$, you need to decompose a ten. How is one ten correctly decomposed?

$1 \text{ ten} = 1 \text{ one}$

$1 \text{ ten} = 100 \text{ ones}$

$1 \text{ ten} = 10 \text{ tens}$

$1 \text{ ten} = 10 \text{ ones}$

To subtract $453 - 162$, we must decompose $1$ hundred into $10$ tens. Why is this step necessary?

Because $3$ is greater than $2$ in the ones place.

Because $5$ is less than $6$ in the tens place.

Because $4$ is greater than $1$ in the hundreds place.

Because we always decompose a hundred for a 3-digit problem.

Subtract Whole Numbers Practice — Grade 4 math

Lesson 5: Subtract Whole Numbers — Practice Questions

1. To prepare for subtraction, the number $6$ tens and $4$ ones is decomposed. It becomes $5$ tens and ___ ones.
2. When preparing to subtract $81 - 25$, you need to decompose a ten. How is one ten correctly decomposed?
- A. $1 \text{ ten} = 1 \text{ one}$
- B. $1 \text{ ten} = 100 \text{ ones}$
- C. $1 \text{ ten} = 10 \text{ tens}$
- D. $1 \text{ ten} = 10 \text{ ones}$
3. The number $8$ hundreds $2$ tens $7$ ones needs to be regrouped to subtract. After decomposing $1$ hundred, it becomes $7$ hundreds ___ tens $7$ ones.
4. To subtract $453 - 162$, we must decompose $1$ hundred into $10$ tens. Why is this step necessary?
- A. Because $3$ is greater than $2$ in the ones place.
- B. Because $5$ is less than $6$ in the tens place.
- C. Because $4$ is greater than $1$ in the hundreds place.
- D. Because we always decompose a hundred for a 3-digit problem.
5. To solve $82 - 39$, the number $82$ is decomposed. If $8$ tens and $2$ ones become $7$ tens and $x$ ones, what is the value of $x$? The new representation is $7$ tens and ___ ones.
6. Calculate the difference: $473 - 256 = \_\_\_$.
7. When solving $849 - 365$, which step is required?
- A. Regroup from the tens to the ones place.
- B. Regroup from the hundreds to the tens place.
- C. No regrouping is needed.
- D. Regroup from the hundreds to the ones place.
8. A farmer harvested 728 apples and sold 453 of them. The number of apples left is ___.
9. In the problem $652 - 124$, after regrouping, what are the new digits in the tens and ones places of the top number?
- A. 4 tens and 12 ones
- B. 5 tens and 12 ones
- C. 4 tens and 2 ones
- D. 6 tens and 12 ones
10. Find the value of $916 - 582$. The result is ___.