Idea 14of 21Builds onInput, rule, output
Week 0 comes first
Why does a table of values start at 0?
Today you'll discover
- what goes in the first row
- how each row follows from the one above
- how to read the answer off the table
Think firstSuzie has $15 and earns $5 a week
Before she has done any chores at all, how much does Suzie have?
Decide first, then press Next. Read the table from the top row down.
Three boxes: has $15 now, earns $5 each week, price $52. Then a table with two columns, week and money, from week 0 at $15 down to week 8 at $55, the week 0 row shaded. The last frame rings the week 8 dot on the graph, the first one at or above the price. The last step asks what goes in week 0 of Jimmy's table.
See the whole ideathe big idea and the key word, in one place
The big idea
A table of values starts at 0, with what you have before anything changes.
Row by row
Each row down, the week goes up by 1 and the money goes up by 5. The change in the rule is the change between rows.
- Week 0$15
- Week 1$20
- Week 2$25
- Week 8$55
Easy to get wrongDo not start the table at week 1. That row is already after one week of chores, and it hides the money Suzie had at the start.
Key word
- table of values
- a two-column table: each input (like the week) beside its output (like the money)
Ready to use it?
- Make a table of values that starts at 0.
- Read a table to find when the savings are enough.