Expanded Form Check

{"questions":[{"content":"What is the value of the digit 6 in 4,621?<br>[[input-1]]","widgets":{"input-1":{"type":"input","answer":"600"}},"hints":["Find the place occupied by 6."],"explanation":"The 6 is in the hundreds place, so its value is 600."},{"content":"What number is 7,000 + 80 + 5?<br>[[input-2]]","widgets":{"input-2":{"type":"input","answer":"7085"}},"hints":["A missing place is represented by zero."],"explanation":"There are 7 thousands, 0 hundreds, 8 tens, and 5 ones."},{"content":"Which is the expanded form of 934?<br>[[choice-3]]","widgets":{"choice-3":{"type":"choice","options":["900 + 30 + 4","90 + 30 + 4","900 + 34 + 4","9 + 3 + 4"],"answer":[0],"explanations":["934 contains 900, 30, and 4.","","",""]}},"hints":["Separate hundreds, tens, and ones."],"explanation":"934 contains 900, 30, and 4."},{"content":"Complete: 5,482 = 5,000 + ___ + 80 + 2.<br>[[input-4]]","widgets":{"input-4":{"type":"input","answer":"400"}},"hints":["Look at the hundreds digit."],"explanation":"The digit 4 represents 400."},{"content":"Which number has 3 thousands, 2 hundreds, 0 tens, and 9 ones?<br>[[choice-5]]","widgets":{"choice-5":{"type":"choice","options":["3,209","3,290","3,029","32,009"],"answer":[0],"explanations":["3,209 has digits 3, 2, 0, and 9 in those places.","","",""]}},"hints":["Place each digit in its stated column."],"explanation":"3,209 has digits 3, 2, 0, and 9 in those places."},{"content":"What is the value of the digit 5 in 8,054?<br>[[input-6]]","widgets":{"input-6":{"type":"input","answer":"50"}},"hints":["The 5 is in the tens place."],"explanation":"Five tens have a value of 50."},{"content":"Why does 4,006 include two zeros?<br>[[choice-7]]","widgets":{"choice-7":{"type":"choice","options":["There are no hundreds or tens","There are no thousands","The number is equal to 46","Zeros are always ignored"],"answer":[0],"explanations":["The zeros hold the hundreds and tens places.","","",""]}},"hints":["Think about the empty place-value columns."],"explanation":"The zeros hold the hundreds and tens places."},{"content":"Write 9,000 + 500 + 1 as a number.<br>[[input-8]]","widgets":{"input-8":{"type":"input","answer":"9501"}},"hints":["Use zero in the tens place."],"explanation":"9,000 + 500 + 1 = 9,501."}],"mix":1}