Question

Is she correct? Explain.

Sarah says that she skip-counted:
2, 2, 2, 2
How do you know?
a) Yes, because skip-counting involves adding the same number repeatedly.
b) Yes, because skip-counting involves counting by twos.
c) No, because skip-counting should involve counting by different numbers.
d) No, because skip-counting is not a valid mathematical operation.

Answer 1

Skip-counting involves adding the same number repeatedly, and Sarah's sequence of 2, 2, 2, 2 represents skip-counting by two, therefore, she is correct. This aligns with the consistent and universal rules of addition in mathematics.

Step-by-step explanation:

The student, Sarah, says that she skip-counted: 2, 2, 2, 2, and is questioning whether this is correct. Skip-counting typically refers to counting forward by a specific number each time, starting from a number that is not necessarily the first in the sequence. For example, if Sarah is counting by twos, the sequence would ideally start from 2 and then increase by 2 each time, such as 2, 4, 6, 8, and so forth. Therefore, the correct answer to whether Sarah skip-counted correctly is a) Yes, because skip-counting involves adding the same number repeatedly. This is based on the rules of mathematics, which state that addition is a consistent operation where the sum of a repeated addition of the same number represents skip-counting by that number.