What this lesson shows
Triangles made of toothpicks: 3, 6, 9. A table lists the triangles, 1, 2, 3, beside the toothpicks, 3, 6, 9. Each new triangle adds 3 toothpicks in the picture and 3 in the table.
The worked example
The lesson works this one step by step: 1, 2, 3 triangles of toothpicks. Then your kid tries one like it on paper.
The steps
- One row for each picture
- Count the toothpicks
- A shape more or less: its toothpicks too
- Read the table both ways
Helping at home
Your kid counts the toothpicks in each picture and writes them in a table, one row a picture. Point to a row and ask: "Which picture is this? What changed from the last one?"
If your kid gets stuck
One row for each picture: the shapes, then the toothpicks.
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.
More in this unit
- Equal groups and arrays
- Groups or how many in each?
- Two kinds of division
- Equal jumps on a number line
- Turn the array
- Facts from facts you know
- Add the parts
- One digit times two digits
- Multiply both parts
- Three factors, any order
- Times tens and hundreds
- Counting zeros fails
- One array, four facts
- True or false?
- The answer can go first
- The unknown anywhere
- Even or odd?
- The ones digit decides
- Is it a multiple?
- A number is its own multiple
- Patterns from a rule
- Position is not value
- Two-step word problems
- Finish the second step