Page 28 - PlayFacto_S3
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Number pattern
Number pattern is an ordered set of numbers.
1 , 3 , 5 , 7 , 9 , 11 , 13 , ...
+2 +2
Rule: Increase by 2 from 1.
30 , 27 , 24 , 21 , 18 , 15 , ...
-3 -3
Rule: Decrease by 3 from 30.
2 , 3 , 5 , 8 , 12 , 17 , 23 , ...
+1 +2
Rule: Increase the number you add by 1 each time.
Example 1 Find the rule. Complete each number pattern.
⑴ 2, 4, 6, 8, 10, 12, 14,
⑵ 3, 6, 9, 12, 15, 18, 21,
⑶ 50, 45, 40, 35, 30, 25, 20,
3. The 9th number 25
Number pattern is an ordered set of numbers.
1 , 3 , 5 , 7 , 9 , 11 , 13 , ...
+2 +2
Rule: Increase by 2 from 1.
30 , 27 , 24 , 21 , 18 , 15 , ...
-3 -3
Rule: Decrease by 3 from 30.
2 , 3 , 5 , 8 , 12 , 17 , 23 , ...
+1 +2
Rule: Increase the number you add by 1 each time.
Example 1 Find the rule. Complete each number pattern.
⑴ 2, 4, 6, 8, 10, 12, 14,
⑵ 3, 6, 9, 12, 15, 18, 21,
⑶ 50, 45, 40, 35, 30, 25, 20,
3. The 9th number 25
