Problem
Winter is 2 times summer's 2 students, so 2 × 2 = 4 students were born in winter.
'2 times' means gathering two equal groups, each as big as summer's count. Summer's 2 circles are matched one-to-one with 2 students, so gathering two such groups gives winter's count of 4.
3.OA.A.3Identify SubproblemsAdding spring 6, summer 2, autumn 5, and winter 4 gives 17 students.
The total number surveyed is exactly the four seasons' counts added together. Now that winter has been found, adding all four parts with nothing left out gives the total.
3.MD.B.3Identify SubproblemsThe number of students born in winter is 4.
Winter is 2 times the summer count, and 2 times a number means two equal groups, each as big as that number.
Two equal groups of 2, gathered together and counted, is exactly what multiplying 2 by 2 means.
Each of those equal groups holds 2, because the summer column shows 2 circles and every circle stands for one student.
Each circle is matched with exactly one student, so the number of circles is the number of students.
Apply clues one at a time to fill in a blank column. Once the multiple clue fills in winter, add everything for the total.