Learn to collect, organize, and present data using tally marks, pictographs, and bar graphs.
When counting how many times something happens, tally marks help organize the count in groups of five — four vertical lines with a fifth crossing through, making large counts easy to read at a glance.
If 7 students chose blue as their favorite color, how would you show that in tally marks?
IIII II — a group of 5 plus 2 more
A tally shows IIII IIII I. How many does this represent?
11 — two groups of 5 plus 1 more
Once data is collected, it can be shown visually — a pictograph uses repeated symbols, while a bar graph uses bars of different heights, both making it easy to compare values at a glance.
In a pictograph, each 🍎 = 4 apples. If a row has 3 apples symbols, how many apples does that represent?
3 × 4 = 12 apples
A bar graph shows rainfall: June 40mm, July 90mm, August 60mm. Which month had the most rainfall?
July
1. How would you show 9 in tally marks?
2. A tally shows IIII IIII IIII. How many does this represent?
3. In a pictograph, each 📚 = 5 books. If a row has 4 book symbols, how many books does that represent?
4. A bar graph shows sales: Toy A 30, Toy B 55, Toy C 20. Which toy sold the most?
5. In the same graph, how many more Toy B sold than Toy C?