Lesson · Grade 3 · Mathematics
Writing a Pattern Rule: Start at 3, Add 2 Each Time
- Grade 3
- Mathematics
- 58 s
- British Columbia
- BC3-MA-18
Towers of 3, 5, 7 and 9 blocks are counted, and the video shows that the pattern starts at 3 and that each tower has 2 more blocks than the one before (3 + 2 = 5, 5 + 2 = 7, 7 + 2 = 9). The rule is written in words and numbers, "Start at 3. Add 2 each time.", then used to find the next tower (9 + 2 = 11), which is checked by counting its blocks.
Concept: Writing a pattern rule in words and numbers
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In one sentence
The question this lesson answers
What is the rule for this block pattern?
Count the blocks in each tower: 3, 5, 7, 9.
Transcript
What the lesson says
What is the rule for this block pattern?
Count the blocks in each tower: 3, 5, 7, 9.
The first tower has 3 blocks, so the pattern starts at 3.
Each tower has 2 more blocks than the one before.
3 plus 2 is 5.
5 plus 2 is 7.
7 plus 2 is 9.
Now write the rule using words and numbers.
First, say where it starts: start at 3.
Then say how it grows: add 2 each time.
The rule gives the next tower: 9 plus 2 is 11.
Count the blocks to check: there are 11.
A pattern rule tells where to start and how the pattern changes.
Curriculum
Where this fits
- British Columbia, Grade 3
Mathematics, Patterns and algebra: pattern rules using words and numbers, based on concrete experiencesBC3-MA-18
Previous: Increasing and Decreasing Patterns: Find What Changes Each StepNext: Finding the Missing Number
The outcomes and strands follow the British Columbia curriculum.
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