Grade 4 Patterns: Unit Review

Worked examples

Real problems from the practice worksheets, solved one step at a time.

1. Example 1

   81318?28?

   Fill in the missing terms

   1. Compare numbers that sit next to each other: 8 → 13 is +5, 13 → 18 is +5.
   2. The rule is add 5: each number is 5 more than the one before.
   3. Use the rule to fill the blanks: 18 + 5 = 23 (check: 23 + 5 = 28, the next number ✓); 28 + 5 = 33.
   4. So the missing numbers are 23, 33.

   Answer: 23, 33

2. Example 2

   111315?19?

   Fill in the missing terms

   1. Compare numbers that sit next to each other: 11 → 13 is +2, 13 → 15 is +2.
   2. The rule is add 2: each number is 2 more than the one before.
   3. Use the rule to fill the blanks: 15 + 2 = 17 (check: 17 + 2 = 19, the next number ✓); 19 + 2 = 21.
   4. So the missing numbers are 17, 21.

   Answer: 17, 21

3. Example 3

   61116?26?

   Fill in the missing terms

   1. Compare numbers that sit next to each other: 6 → 11 is +5, 11 → 16 is +5.
   2. The rule is add 5: each number is 5 more than the one before.
   3. Use the rule to fill the blanks: 16 + 5 = 21 (check: 21 + 5 = 26, the next number ✓); 26 + 5 = 31.
   4. So the missing numbers are 21, 31.

   Answer: 21, 31