Idea 7of 22Builds onEqual groups keep the ratio
A ratio table, group by group
How does a ratio table keep track of equivalent ratios?
Today you'll discover
- what one column of the table is
- what changes from column to column
- how to jump to a far column
Think first2 orange for every 3 blue, one column per group
The second column is 2 groups. What goes in it?
Decide first, then press Next. Read each column top to bottom.
A two-row table, orange on top and blue below. First only the column 2 and 3 is filled; then columns 4 and 6, 6 and 9, 8 and 12, 10 and 15. Curved marks between columns say plus 2 on top and plus 3 below. Then arrows times 5 jump from the first column to the last, which is ringed. The last step asks for 4 groups of 3 orange and 5 blue.
See the whole ideathe big idea and the key word, in one place
The big idea
A ratio table lists equivalent ratios: each column adds one more group.
The tableorange: 2, 4, 6, 8, 10. blue: 3, 6, 9, 12, 15. Every column is 2 orange for every 3 blue.
Easy to get wrongAdding works only when you add a whole group: 2 to the top and 3 to the bottom. Adding the same number to both rows breaks the ratio.
Key word
- ratio table
- a table with one row for each amount, where every column is an equivalent ratio
Ready to use it?
- Complete a ratio table.
- Jump to a far column by multiplying both rows.