Number Patterns, Input Output Tables

Inside the case file

These number patterns worksheets give your 3rd grade class ten CSI Mini Mystery Detective cases set in a toy factory, all built around arithmetic patterns and 3.OA.D.9. Students extend patterns on conveyor belts, find the missing numbers on hundreds chart pieces, skip count through the times tables and work out the rule on input output tables. Use them in math centers, for morning work or as homework right through your patterns unit. They're no prep, and every case comes with an answer key.

Four of the ten cases are drawn pages, so students spend some cases filling in toy boxes on a moving belt and gaps in a machine table, and others working through written problems. Each answer crosses a suspect off the list, which means students check their own work as they go and the page marks itself. One case fits neatly into a 20 minute math block.

What's Inside

• 10 one-page cases with 20 answers each, and an answer key for every case
• 4 drawn pages: two conveyor belt pages, a hundreds chart puzzle page and an input output table page
• 6 pages of written problems: missing numbers, skip counting, doubling and halving, addition table patterns and mixed review
• A reference page with a worked example for each kind of pattern
• Contents page, teacher instructions, a case log and a certificate
• 30 pages in black and white

The Cases

1. The Runaway Robots - adding patterns on a conveyor belt
2. The Squeaky Duck Swap - counting back along the belt
3. The Wobbly Spinning Tops - missing numbers in a pattern
4. The Broken Building Blocks - skip counting the times tables
5. The Missing Puzzle Pieces - hundreds chart puzzle pieces
6. The Double Dollhouse - doubling, tripling and halving patterns
7. The Bouncing Ball Blunder - patterns in the addition table
8. The Mixed-Up Machine - input output tables with a hidden rule
9. The Teddy Bear Heist - patterns and machines mixed together
10. The Drum Roll Disaster - a review of every pattern

When to Use This Resource

Start with cases 1 and 2 once your class has begun extending patterns, and save the hundreds chart and addition table cases for the lessons where you look for patterns in a chart. The input output tables in case 8 lead straight into the function tables of 4th grade, so it also makes a good stretch for a strong group. Cases 9 and 10 bring everything together, ready for review before a test. The pages work well for math centers, small groups, early finishers, sub days, test prep and homework.

Grade Levels

Made for 3rd grade (3.OA.D.9). It also works as a patterns review at the start of 4th grade, before pattern rules and input output tables (4.OA.C.5).

Why Teachers Love Mystery Detectives

Every Mystery Detective pack works the same way. Once your class has solved one case, they know what to do with the next one, in this pack or any other. Each case also stands on its own, which means you can choose the one that fits what you're teaching that day. Naming the villain gives every page a clear end point, and the answer key lets you check a page quickly.

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