Sara is counting by 3's. If she starts counting at -30, what are the two missing numbers?
-30, -27, -24, -21, _, _, -12

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Solution

Sara starts counting from -30
Each time, she is counting by 3's, so
-30 + 3 = -27, as addition of two opposite sign integers results subtraction of integers with sign of larger value.

Now, -27 is the next number.
Similarly, -27 + 3 = -24, -24 + 3 = -21, -21 + 3 = -18, -18 + 3 = -15, -15 + 3 = -12

Hence, missing numbers are -18, -15

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