Which option best describes decomposing numbers?

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Multiple Choice

Which option best describes decomposing numbers?

Explanation:
Decomposing numbers means splitting a number into parts that add up to the original. The most common form is breaking it into place-value components, like tens and ones. For example, 56 can be written as 50 + 6 or 34 as 30 + 4. This helps with mental math and understanding how the value is built from each digit, making addition, subtraction, and comparisons easier. Rounding to the nearest ten is an estimation, not a decomposition. Breaking into halves is dividing into two equal parts, which is a different operation. Estimating sums is also estimation, not splitting a number into its parts.

Decomposing numbers means splitting a number into parts that add up to the original. The most common form is breaking it into place-value components, like tens and ones. For example, 56 can be written as 50 + 6 or 34 as 30 + 4. This helps with mental math and understanding how the value is built from each digit, making addition, subtraction, and comparisons easier. Rounding to the nearest ten is an estimation, not a decomposition. Breaking into halves is dividing into two equal parts, which is a different operation. Estimating sums is also estimation, not splitting a number into its parts.

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