Repeated Addition with Arrays & Equal Groups

Inside the case file

Repeated addition worksheets for 2nd grade and 3rd grade, with equal groups and arrays on every page: five printable math cases, Mystery Detective style, twenty problems a case. Print and go with full answer keys and a wanted poster set for the wall, no prep, for math centers, morning work, early finishers, homework and sub plans. Students count the groups, read the array and add the same number over and over, each total takes a teacher off the wanted board, and a wrong total matches no clue, so the bridge into multiplication is built without you marking it, from one CSI Mini Mystery Detective download.

Twenty identical rows of equal groups is the dullest page in second grade, and hiding them inside a hunt is the only way anyone practices them. The arrays sit beside the groups, which is where the jump to times tables quietly starts, and one case fills a center rotation. Five math pages and one Mystery Detective wanted board cover the block before the first times tables.

Students count equal groups, read arrays and write repeated addition sentences, then match each total to a clue. The cases move from twos, fives and tens up to threes, sixes and nines. One teacher in the school has turned into a monster, and the totals show who.

The Five Cases

• Case 1: twos, fives and tens
• Case 2: the same groups with bigger totals
• Case 3: threes and sevens, with arrays
• Case 4: threes, sixes and nines
• Case 5: fours, sixes, eights and nines mixed

What's Inside

• Five cases, each with a problem page and a clue page
• Equal groups, arrays and repeated addition
• A black and white version
• Answer keys for all five
• Wanted posters and a banner

What Is a CSI Mini Mystery Detective?

Each case has a problem page and a clue page. Students work out each total and cross off the teacher with that number. The teacher who's left is the monster.

When to Use This Resource

Use these after skip counting and before multiplication facts. 3rd graders can use them as a warm-up at the start of the year. The posters make a classroom display. They also work as homework, with small groups and on sub days.

Grade Levels

Written for 2nd grade and 3rd grade.

Why Teachers Love These Cases

• A step from repeated addition to multiplication
• Five cases that get harder
• Wanted posters included
• No prep

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