Lesson · Grade 4 · Mathematics
Increasing and Decreasing Patterns: A Start Number and a Rule
- Grade 4
- Mathematics
- 1 min 7 s
- British Columbia
- BC4-MA-18
Starting at 50 with the rule "take away 4 each time", the video fills a Step and Number table one jump at a time (50, 46, 42, 38, 34, 30), checks the last number with 5 × 4 = 20 and 50 − 20 = 30, and names the pattern decreasing because the numbers get smaller. Then it shows the same start with "add 4 instead" (50, 54, 58, 62), names that pattern increasing, and ends on the recap "Write the start number, then use the rule again and again."
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In one sentence
The question this lesson answers
Many number patterns are made from a start number and a rule.
Our start number is 50, so it goes in step 1.
Transcript
What the lesson says
Many number patterns are made from a start number and a rule.
Our start number is 50, so it goes in step 1.
Our rule is take away 4 each time.
50 take away 4 is 46.
46 take away 4 is 42.
42 take away 4 is 38.
38 take away 4 is 34.
34 take away 4 is 30.
To check, 5 jumps of 4 is 20 in all.
And 50 take away 20 is 30, just like the table.
The numbers get smaller each time, so this pattern is decreasing.
If the rule is add 4 instead, we get 50, 54, 58, 62.
Those numbers get bigger each time, so that pattern is increasing.
Write the start number, then use the rule again and again.
Curriculum
Where this fits
- British Columbia, Grade 4
Mathematics, Patterns and algebra: increasing and decreasing patterns, using tables and chartsBC4-MA-18
The outcomes and strands follow the British Columbia curriculum.
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