Hinglish

Pictographs

Class 6 Maths · Chapter 4: Data Handling and Presentation · NCERT Ganita Prakash section 4.2

Learn

A pictograph shows data with pictures. Here one symbol stands for one tree planted by each class's eco club. At a glance: Class 6C planted the most, and 6E the fewest.

A symbol can stand for many. In the school library, one book symbol = 10 books borrowed. 6A has 4 symbols, so 4 × 10 = 40 books. 6B has 3 and a half symbols: 30 + 5 = 35 books.

4 × 10 = 40 · 3½ × 10 = 35 · 2 × 10 = 20

Drawing a pictograph: Kabir counted cycles parked at school: 40 on Monday, 45 on Tuesday, 25 on Wednesday, 30 on Thursday. Drawing one symbol per cycle would take forever! So he chose the key 1 symbol = 5 cycles.

40 ÷ 5 = 8 · 45 ÷ 5 = 9

Explore: draw pictographs yourself. Choose how many symbols each day needs.

  1. Cycles: Mon 40, Tue 45, Wed 25, Thu 30. One symbol = 5 cycles.
  2. Now use a bigger key: one symbol = 10 cycles. Use half symbols for 5.

Remember

  • A pictograph shows data with pictures; the key tells what one symbol stands for.
  • For big numbers choose a bigger key; half a symbol shows half the key.

Quick check

Key: one symbol = 10 mangoes. How many mangoes do 3½ symbols show?

  1. 30
  2. 35
  3. 40
  4. 350
Answer

35. 3 × 10 = 30, and half of 10 is 5: 30 + 5 = 35.

Think about it

With one symbol = 10 cycles, how would you show 42 cycles? What is the problem?

One answer

42 is 4 symbols and two-tenths of another. Such a small part is hard to draw, so we round to about 4 symbols, or choose a key like 2 that divides the numbers exactly.

Practice

Practise with fresh questions at three levels (easy, medium, hard), some answered hands-on, with hints and worked answers. Get 4 of your last 5 right to finish the topic.