4-Digit Subtraction with Regrouping

Inside the case file

Zoo animals 4 digit subtraction with regrouping worksheets for 3rd grade and 4th grade, five math activities run as Mystery Detective cases at the zoo. Print and go, no prep, full answer keys and a black and white set, for math centers, morning work, early finishers, homework and sub plans, any month and any animal unit. The zoo setting suits an animal unit, a zoo trip or any month a class needs the practice, and underneath it is 4 digit subtraction with regrouping, borrowing across zeros included, for 3rd grade and 4th grade. It works as a math center, a homework set or a sub plan, and a CSI Mini Mystery Detective is a page students finish rather than put down.

Four digit subtraction is where borrowing across a zero becomes second nature, given enough of them. A case gives that mileage happily, and students check their own borrowing as they cross the suspects off. Pair it with the safari addition pack and the zoo carries a whole week of math in Mystery Detective style.

The Cases

• The Tigers Stripes - a count nobody can agree on
• The Missing Fruit - somebody has taken it
• Midnight Calls - working out who was where
• Zoo Prize - a total that does not add up
• Animal Escape - the last case of the set

What's Inside

• Five color case pages, sixteen subtraction problems on each
• The same five cases again in black and white
• Answer keys for all five cases
• A color in page for early finishers
• A teacher instruction page, print and go with nothing to prepare
• Four digit subtraction with regrouping throughout

What Is a CSI Mini Mystery Detective?

One printed page holding one crime and the clue list that solves it. Each clue carries a number, the sixteen problems on the page produce those numbers, and a correct answer knocks a clue out. Work to the last question and a single suspect is left standing. Get one wrong and nothing matches, which sends a student back over their working before you ever see it.

When to Use This Resource

Reach for this once column subtraction has been taught and simply needs keeping warm, or as review before a test. It fits an animal or zoo unit, a class trip week, and any season from fall through winter to spring. Use it for math centers, morning work, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group or one student.

Grade Levels

Written for 3rd grade, 4th grade and 5th grade. Sixth graders who still need borrowing firmed up get real use out of it, and a strong second grader will manage the early cases with support.

Why Teachers Love These Cases

• A wrong answer matches no clue, so students catch their own slips
• Color and black and white are both in the download
• A color in page for whoever finishes first
• Five cases covers a full week of centers from one print run

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