Grade 3 Math Unit14.2 Bar Graphs (Reading and Making)

Today's lesson is bar graphs, where each bar grows up from the zero line and the number at its top is the answer. Every bar climbs from the baseline, so its height is the answer: 2, 4, 6 and 8 votes side by side Carry the top of a bar straight across to the scale: Adventure 7, Cartoons 5, Sports 3 A scale can count by 1, 2, 5 or 10; by ones would take 21 lines, so one board counts 0, 5, 10, 15, 20 One bar at 10 against a bar at 6 is 4 more, measured between their two tops Read every bar and add them all: 4, 8, 6 and 10 books make 28 On two boards with identical ink, the Cats bar is 3 votes on a ones scale and 15 on a fives scale Pupils finish able to read a bar against any scale and to answer how many more questions by comparing tops, not ink. CHAPTERS 0:00 What a bar graph is 0:52 Reading a bar at its top 2:52 What one gridline stands for 4:51 Most, least, and how many more 6:43 Two-step questions on one scale 8:35 Two scales, and a bar that grows 10:32 What to practise next