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Complete the Number Sequence · 2
Practice and check
Worked example
Use the displayed +, − or × rule repeatedly. Write the missing number.
+ 4 → 19 → 19
- Read one problem and its conditions before starting. Work without a timer, and keep the key visible where the task requires it.
- Apply the printed change at every step; a missing middle value must fit both neighbours.
- a → a+k → a+2k · Step 1: +4 · Step 2: +4 · Step 3: ×2 / ×3
Check answers after trying
1: 19 2: 12 3: 64 4: 75 5: 112 6: 72
Use the displayed +, − or × rule repeatedly. Write the missing number.
Why this answer
- 1. + 4 → 19 → 19
- 2. + 4 → 12 → 12
- 3. − 4 → 64 → 64
- 4. − 4 → 75 → 75
- 5. × 2 → 112 → 112
- 6. × 3 → 72 → 72
- If an answer differs, return to the first step that differs and explain the choice. Change the answer after checking rather than guessing a new rule.
- Try the next step when the current method feels manageable. You may repeat a problem, use a paper marker, or stop and return later.
- Original practice activities, not a standardized test or IQ score. Steps describe the task, not an age or ability grade.
Tips for Parents
What is on the sheet Use the displayed +, − or × rule repeatedly. Write the missing number. a → a+k → a+2k · Step 1: +4 · Step 2: +4 · Step 3: ×2 / ×3 Original practice activities, not a standardized test or IQ score. Steps describe the task, not an age or ability grade. Try one example Use the displayed +, − or × rule repeatedly. Write the missing number. + 4 → 19 → 19. Read one problem and its conditions before starting. Work without a timer, and keep the key visible where the task requires it. Check a difficulty Apply the printed change at every step; a missing middle value must fit both neighbours. If an answer differs, return to the first step that differs and explain the choice. Change the answer after checking rather than guessing a new rule. Choose the next step a → a+k → a+2k · Step 1: +4 · Step 2: +4 · Step 3: ×2 / ×3 Try the next step when the current method feels manageable. You may repeat a problem, use a paper marker, or stop and return later.
What This Worksheet Builds
Use the displayed +, − or × rule repeatedly. Write the missing number. Apply the printed change at every step; a missing middle value must fit both neighbours.
Next Step
a → a+k → a+2k · Step 1: +4 · Step 2: +4 · Step 3: ×2 / ×3 Try the next step when the current method feels manageable. You may repeat a problem, use a paper marker, or stop and return later.