Rounding to the Nearest 10 and 100

Inside the case file

Rounding to the nearest 10 and 100 worksheets, rounding whole numbers practice, and place value review for 3rd grade and 4th grade are all included in this no-prep Mini Mystery Detective pack of math worksheets, with ten cases set during a school day. Use them for math centers, morning work, early finishers or homework, with an answer key for every case.

What's Inside

• Rounding two-digit and three-digit numbers to the nearest 10 (52, 145, 396, 885)
• Rounding three-digit and four-digit numbers to the nearest 100 (579, 1,544, 2,858, 7,516)
• Deciding which place to round to when both appear on the same page
• Rounding numbers that cross into the next hundred or thousand (396, 1,299, 2,597)
• Rounding up when there is a 5 in the rounding place (145, 885, 2,225)
• Using place value to find the answer, then checking it against the suspect list
• A worked example printed on every page, so students can start without a mini-lesson
• Answer keys for every case

Ten school-day cases to crack: The Jammed Locker, The Lunch Order Mix, The Overdue Book, The Paint Spill, The Field Day Fix, The Bus Bay Blunder, The Spelling Bee Slip, The Snack Cart Swap, The Lost Stopwatch and The Broken Beaker. The cases build from rounding to the nearest 10 alone, to the nearest 100 alone, and then to pages that mix the two. Nothing is seasonal, and it works any month of the year.

What is a Mini Mystery Detective?

A no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Every answer on the page matches one suspect's ID badge. A correct page eliminates the suspects one at a time and leaves a single name. If more than one name is left at the end, a student knows an answer needs checking and can go back to it before handing the page in.

When to Use This Resource

• Bell ringers
• Emergency sub plans
• Independent practice
• Spiral review and test prep
• Small-group intervention
• Whole-class warm-ups

Grade Levels

Designed for 3rd and 4th graders. 5th graders who need more rounding and place value practice can use it as well, and so can advanced 2nd graders.

Why Teachers Love Mystery Detectives

• No prep
• Self-checking
• Answer keys for every page
• A school day mystery in each case
• Rounding to the nearest 10 and 100 on every page
• Black and white printing, no color ink needed
• Works any time of year

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