Arrays

{"questions":[{"content":"An array has 3 rows with 5 dots in each row. How many dots are there?<br>[[input-1]]","widgets":{"input-1":{"type":"input","answer":"15"}},"hints":["Multiply rows by dots per row."],"explanation":"3 × 5 = 15."},{"content":"An array has 4 rows with 2 stars in each row. How many stars are there?<br>[[input-2]]","widgets":{"input-2":{"type":"input","answer":"8"}},"hints":["Count equal rows."],"explanation":"4 × 2 = 8."},{"content":"An array has 18 counters in 3 equal rows. How many counters are in each row?<br>[[input-3]]","widgets":{"input-3":{"type":"input","answer":"6"}},"hints":["Divide 18 by 3."],"explanation":"Each row contains 6 counters."},{"content":"Which equation matches 2 rows of 6?<br>[[choice-4]]","widgets":{"choice-4":{"type":"choice","options":["2 × 6 = 12","2 + 6 = 8","6 − 2 = 4","12 × 2 = 24"],"answer":[0],"explanations":["Two equal rows of six contain twelve.","","",""]}},"hints":["Rows × amount in each row."],"explanation":"Two equal rows of six contain twelve."}],"mix":1}