Compound bar charts worksheet

Part A: Working out and filling in

1. 1. Children: Feb − Mar = 5000

   Key: the left bars are children, the right adults; each grid line stands for 1000. Children: Feb: 8 × 1000 = 8000; Mar: 3 × 1000 = 3000; 8000 − 3000 = 5000

2. 2. 4C: boys − girls = 6

   Key: the left bars are boys, the right girls; each grid line stands for 2. 4C: boys: line 5, 5 × 2 = 10; girls: line 2, 2 × 2 = 4; 10 − 4 = 6

3. 3. Most in one house: 70 pupils

   Each grid line stands for 5. Count each house's two bars in grid lines: Red 8 + 6 = 14; Blue 1 + 2 = 3; Green 4 + 4 = 8; Yellow 5 + 7 = 12. The most is Red, 14 lines, 14 × 5 = 70

4. 4. 4B: girls − boys = 2

   Key: the left bars are boys, the right girls; each grid line stands for 2. 4B: boys: line 5, 5 × 2 = 10; girls: line 6, 6 × 2 = 12; 12 − 10 = 2

5. 5. Most in one class: 280 books

   Each grid line stands for 20. Count each class's two bars in grid lines: 5A 1 + 3 = 4; 5B 6 + 8 = 14; 5C 3 + 6 = 9; 5D 6 + 5 = 11. The most is 5B, 14 lines, 14 × 20 = 280

6. 6. All girls: 28 pupils

   Key: the left bars are boys, the right girls; each grid line stands for 2. Count the grid lines of the girls bars first: 4A 6, 4B 1, 4C 5, 4D 2; 6 + 1 = 7, 7 + 5 = 12, 12 + 2 = 14, 14 lines, 14 × 2 = 28

7. 7. 5000 visitors

   Find the female bars from the key and what a line stands for, then count the lines up to the top of September's bar.

   September's female bar reaches line 1, and a line is 5,000: 1 × 5,000 = 5,000 visitors.

8. 8. 8000 visitors

   Find the male bars from the key and what a line stands for, then count the lines up to the top of March's bar.

   March's male bar reaches line 4, and a line is 2,000: 4 × 2,000 = 8,000.

9. 9. 5000 dollars

   One of April's bars stops halfway between lines, so count half a line. Count the gap in lines first, then multiply by what a line is.

   In April Shop B's bar stops halfway between lines: 1.5 lines, 1.5 × 10,000. Count the gap in lines, then multiply: 5,000 dollars.

10. 10. 1300000 visitors

    Use the key to pick out only this year's four bars. Add up their lines, then multiply by what a line stands for.

    Only this year's four bars: 13 lines in all, 100,000 each: 13 × 100,000 = 1,300,000.

11. 11. 9 lines

    Round 8,648 to the nearest thousand first: look at its hundreds digit.

    The hundreds digit is 6, so to the nearest thousand it is about 9 thousands: 9 lines.

Part B: Choose, or true or false

1. 12. C. January

   Every line stands for the same amount, so no need to read each bar: just count how many lines apart each month's two bars are.

   Every line stands for the same amount, so compare the gaps in lines: January's is 6, the most.

Part C: Word problems

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

1. 13. A compound bar chart shows the boys and girls in two classes. Class A has 16 boys and 17 girls. Class B has 14 boys and 13 girls. How many more pupils does Class A have than Class B? (Answer: 6 pupils)

   16 + 17 − (14 + 13) = 6

2. 14. A compound bar chart shows the boys and girls in two classes. Class A has 18 boys and 15 girls. Class B has 14 boys and 13 girls. How many more pupils does Class A have than Class B? (Answer: 6 pupils)

   18 + 15 − (14 + 13) = 6

3. 15. A compound bar chart shows the boys and girls in two classes. Class A has 19 boys and 12 girls. Class B has 18 boys and 17 girls. How many more boys than girls are there in the two classes together? (Answer: 8 pupils)

   19 + 18 − (12 + 17) = 8

4. 16. 10000 dollars

   Add up the lines in Shop A's four bars and in Shop B's four bars first, then find the gap.

   Shop A: 6 + 9 + 1 + 2 lines; Shop B: 5 + 3 + 2 + 7. 1 lines apart: 1 × 10,000 = 10,000.

5. 17. 2 times

   Every line stands for the same amount, so just count the lines in July's overseas and local bars.

   Overseas 12 lines, local 6, each line the same: 12 ÷ 6 = 2 times.

6. 18. 10000 visitors

   Use the key to tell last year from this year, count how many lines apart May's two bars are, then multiply.

   This May: 8 lines; last: 6. The gap is 8 − 6 lines at 5,000: 10,000.