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Grade 4 Math · World 5: Pattern and Factor Garden · Level 46
Two-Step Rules
Use rules like "multiply by 3, then add 1".
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 46
- Some rules have two steps. Rule: multiply by 3, then add 1. Put in 4: 4 times 3 is 12, then add 1 to get 13.
- Order matters! If you add 1 first and then multiply, 4 plus 1 is 5, and 5 times 3 is 15. That's a different rule.
- Start at 1 and use the rule again and again: 1, 4, 13, 40. Notice: they go odd, even, odd, even!
- Two-step rules are everywhere. Renting a canoe costs $5 an hour, plus $3 to sign up. For 4 hours: 4 times 5 is 20, plus 3 is $23.
Georgia's K-12 Mathematics Standards:
- 4.PAR.3.1 — Generate both number and shape patterns that follow a provided rule.
- 4.PAR.3.2 — Use input-output rules, tables, and charts to represent and describe patterns, find relationships, and solve problems.