Decimals Adding & Subtracting - Crack the Code Math Practice

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4.9 (5 ratings)

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Desktop Learning Adventures

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Grade Levels

5th - 7th, Homeschool

Subjects

Math, Math Test Prep, Decimals

Resource Type

Activities, Centers

Standards

CCSS5.NBT.A.3a

CCSS5.NBT.A.3b

CCSS5.NBT.B.7

CCSSMP1

CCSSMP2

Formats Included

Pages

11 pages

$3.25

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$3.25

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Description

Standards

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Description

Decimals: Adding & Subtracting ~ Crack the Code!

This activity includes TWO fun and engaging puzzles (grades 5-7) for students to solve, while getting computation practice. They’ll enjoy the challenge and feedback is immediate through solving the puzzles (quotes from The Phantom Tollbooth) correctly.

These Crack the Code puzzles are in table format. Students must determine whether they’re looking for missing addends (using subtraction) or sums as they solve 20 problems (in each puzzle) to fill in the table. A sample problem to show them how to solve these types of problems is included, if needed. There are also two student versions- one with an additional alphabet table to help them organize their answers and one without, in each puzzle.

Built-in problem-solving challenges involve computation errors. One wrong addend or sum can throw off an entire row or column of answers. Their challenge will be finding a way to track down their errors, make their corrections and successfully Crack the Code.

Included in this resource:

♦ Addition & Subtraction of decimals using inverse operation

♦ Teaching Notes and Answer Key

♦ Sample problem to show how to fill in the table

♦ 2 puzzles, 20 problems each, student copies in BW

♦ Aligns with CCSS

Ways to use Crack the Code puzzles~

Centers
Go-to Activities
Fun Class Challenge
Small Group Challenges
Paired Work (Buddy up!)
Test Prep
Homework
Sub Days
RTI

Quotes:

“It shall be unlawful, illegal, and unethical to think, think of thinking, surmise, presume, reason, meditate, or speculate while in the Doldrums.” Lethargians

"Just because you have a choice, it doesn't mean that any of them 'has' to be right."

~ Norton Juster, The Phantom Tollbooth

★ This resource is part of the Phantom Tollbooth Bundle.

Click HERE for additional Crack the Code puzzles.

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Total Pages

11 pages

Answer Key

N/A

Teaching Duration

40 minutes

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Standards

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

CCSS5.NBT.A.3a

Read and write decimals to thousandths using base-ten numerals, number names, and expanded form, e.g., 347.392 = 3 × 100 + 4 × 10 + 7 × 1 + 3 × (1/10) + 9 × (1/100) + 2 × (1/1000).

CCSS5.NBT.A.3b

Compare two decimals to thousandths based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons.

CCSS5.NBT.B.7

Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

CCSSMP1

Make sense of problems and persevere in solving them. Mathematically proficient students start by explaining to themselves the meaning of a problem and looking for entry points to its solution. They analyze givens, constraints, relationships, and goals. They make conjectures about the form and meaning of the solution and plan a solution pathway rather than simply jumping into a solution attempt. They consider analogous problems, and try special cases and simpler forms of the original problem in order to gain insight into its solution. They monitor and evaluate their progress and change course if necessary. Older students might, depending on the context of the problem, transform algebraic expressions or change the viewing window on their graphing calculator to get the information they need. Mathematically proficient students can explain correspondences between equations, verbal descriptions, tables, and graphs or draw diagrams of important features and relationships, graph data, and search for regularity or trends. Younger students might rely on using concrete objects or pictures to help conceptualize and solve a problem. Mathematically proficient students check their answers to problems using a different method, and they continually ask themselves, "Does this make sense?" They can understand the approaches of others to solving complex problems and identify correspondences between different approaches.

CCSSMP2

Reason abstractly and quantitatively. Mathematically proficient students make sense of quantities and their relationships in problem situations. They bring two complementary abilities to bear on problems involving quantitative relationships: the ability to decontextualize-to abstract a given situation and represent it symbolically and manipulate the representing symbols as if they have a life of their own, without necessarily attending to their referents-and the ability to contextualize, to pause as needed during the manipulation process in order to probe into the referents for the symbols involved. Quantitative reasoning entails habits of creating a coherent representation of the problem at hand; considering the units involved; attending to the meaning of quantities, not just how to compute them; and knowing and flexibly using different properties of operations and objects.

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