Line Plots — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A Grade 3 line plot shows: 2 X above 3, 5 X above 4, 1 X above 5. There are 4 fewer X marks above 5 than above 4.
5 minus 1 equals 4, so 4 fewer X marks appear above 5 than above 4 on the Grade 3 line plot.
2. A Grade 3 line plot shows 3 X above 6 and 7 X above 8. The difference in X marks is 4.
7 minus 3 equals 4, so the difference between the two stacks on the Grade 3 line plot is 4.
3. A Grade 3 line plot has 4 X above 2, 4 X above 3, and 2 X above 4. The total number of X marks is 10.
Adding 4, 4, and 2 gives 10, the total X marks on this Grade 3 line plot.
4. A Grade 3 line plot has 6 X above 7 and 2 X above 9. There are 4 more X marks above 7 than above 9.
6 minus 2 equals 4, so 4 more X marks appear above 7 than above 9 on the Grade 3 line plot.
5. On a Grade 3 line plot with 3 X above 5, 5 X above 6, and 4 X above 7, the value with the most data is 6.
5 X marks is the largest stack, and it sits above 6, so 6 is the most common value.
6. A Grade 3 line plot shows 8 X above 10 and 3 X above 12. The difference is 5 X marks.
8 minus 3 equals 5, so the difference between the two stacks on the Grade 3 line plot is 5.
7. A Grade 3 line plot has 2 X above 1, 4 X above 2, 4 X above 3, 2 X above 4. Total X marks 12.
2 + 4 + 4 + 2 equals 12, the total number of X marks on the Grade 3 line plot.
8. A Grade 3 line plot has 1 X above 0 and 6 X above 2. There are 5 more X marks above 2 than above 0.
6 minus 1 equals 5, so 5 more X marks sit above 2 than above 0 on the Grade 3 line plot.
9. A Grade 3 line plot shows 3 X above 4, 3 X above 5, 3 X above 6. The total X marks is 9.
Adding 3 three times gives 9, the total X marks on the Grade 3 line plot.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
5 X above 3 and 2 X above 4 — difference
→ 3
3
4 X above 6 and 4 X above 7 — total
→ 8
8
7 X above 9 and 1 X above 10 — fewer X above 10
→ 6
6
3 X above 2, 5 X above 3, 2 X above 4 — total X marks
→ 10
10
Each Grade 3 line plot question matches a number found by adding or subtracting the X-mark counts.