Christmas Math Mystery Activity: Case of The Selfish Elf (7th Grade) CSI Math

Rated 4.87 out of 5, based on 31 reviews

4.9 (31 ratings)

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Mrs J's Resource Creations

31.2k Followers

Grade Levels

6th - 8th

Subjects

Math, Christmas/ Chanukah/ Kwanzaa, Decimals

Resource Type

Worksheets, Activities, Centers

Standards

CCSS7.NS.A.2a

CCSS7.NS.A.2b

CCSS7.NS.A.2c

CCSS7.NS.A.2d

CCSS7.EE.B.3

Formats Included

Pages

18 pages

$4.50

Wish List

$4.50

Wish List

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What educators are saying

I used this for my 8th grade Math Enrichment class. It took them several days to complete but they were very engaged and loved it.

— amy h.

Rated 5 out of 5

My students love these math mysteries! I was nervous how my older kids would react to them but they really enjoy when I break one of these out to do!

— Allison L.

Rated 5 out of 5

Also included in

Christmas Math Mystery: Case of the Selfish Elf (Differentiated GRADE BUNDLE)
Christmas Math Mystery differentiated bundle for Kindergarten through to 7th Grade - The Case of the Selfish Elf! This download includes all of the grade editions available for this math mystery story packet.You can Clue Swap across the 2nd-7th grade editions to customize/differentiate the math in t
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Price $17.00Original Price $32.00Save $15.00
View Bundle
7th Grade COMPLETE Math Mystery Bundle - CSI Math Review Activities
Math Mysteries the COMPLETE collection for 7th Grade. This complete math mystery bundle contains all of my math mysteries for Grade 7 up to date! Any future 7th Grade Math Mysteries that I make will be added to this bundle. Make math fun and exciting with these engaging activities that will motivat
17
Products
Price $51.20Original Price $64.00Save $12.80
View Bundle

Description

Standards

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Description

Christmas Math Mystery Activity: The Case of The Selfish Elf, 7th Grade Edition (or a harder version if you need). Engage and motivate your students during math time with this fun Christmas activity! Easy prep! Just Print & Solve! Or go paperless with the new Google Slides option provided within your download.

Distance Learning Update: I've added a Word Document within the folder that contains a Google Doc link to share this resource with your students via Google Classroom or Drive. Parts of the pages are editable so that your students can complete without having to print the pages. Please note, you will need to make a copy of the Google Slides to your drive before you can edit.

CLICK HERE TO VIEW BONUS VIDEO HOOK

Includes a Bonus ending video clip to wrap up the case after solving the mystery!

Students must use their math skills to eliminate suspects so they can find out who the Selfish Elf is!

There are 5 clues to crack to solve the mystery:

Clue 1: Convert Fractions to Percents

Clue 2: Multiplying Decimals by Decimals

Clue 3: Dividing Integers

Clue 4: Convert Mixed Numbers to Decimals

Clue 5: Divide Decimals by Decimals

Pack also includes a suspect declaration sheet, answer sheets, elimination guide and awards.

Great Christmas math activity.

See a list of all the Math Mysteries HERE

Case of the SELFISH ELF is also available for other grade levels. Use for differentiation or find a math level that suits your class best.

Christmas Math Mystery: Case of The Selfish Elf (GRADE 1)

Christmas Math Mystery: Case of The Selfish Elf (GRADE 2)

Christmas Math Mystery: Case of The Selfish Elf (GRADE 3)

Christmas Math Mystery: Case of The Selfish Elf (GRADE 4)

Christmas Math Mystery: Case of The Selfish Elf (GRADE 5)

Christmas Math Mystery: Case of The Selfish Elf (GRADE 6)

Merry Christmas!

Total Pages

18 pages

Answer Key

Included

Teaching Duration

N/A

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Standards

to see state-specific standards (only available in the US).

CCSS7.NS.A.2a

Understand that multiplication is extended from fractions to rational numbers by requiring that operations continue to satisfy the properties of operations, particularly the distributive property, leading to products such as (–1)(–1) = 1 and the rules for multiplying signed numbers. Interpret products of rational numbers by describing real-world contexts.

CCSS7.NS.A.2b

Understand that integers can be divided, provided that the divisor is not zero, and every quotient of integers (with non-zero divisor) is a rational number. If 𝘱 and 𝘲 are integers, then –(𝘱/𝘲) = (–𝘱)/𝘲 = 𝘱/(–𝘲). Interpret quotients of rational numbers by describing real-world contexts.

CCSS7.NS.A.2c

Apply properties of operations as strategies to multiply and divide rational numbers.

CCSS7.NS.A.2d

Convert a rational number to a decimal using long division; know that the decimal form of a rational number terminates in 0s or eventually repeats.

CCSS7.EE.B.3

Solve multi-step real-life and mathematical problems posed with positive and negative rational numbers in any form (whole numbers, fractions, and decimals), using tools strategically. Apply properties of operations to calculate with numbers in any form; convert between forms as appropriate; and assess the reasonableness of answers using mental computation and estimation strategies. For example: If a woman making $25 an hour gets a 10% raise, she will make an additional 1/10 of her salary an hour, or $2.50, for a new salary of $27.50. If you want to place a towel bar 9 3/4 inches long in the center of a door that is 27 1/2 inches wide, you will need to place the bar about 9 inches from each edge; this estimate can be used as a check on the exact computation.

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