# Add and Subtract Decimals

These puzzles are a great way to hone students’ math vocabulary skills. Our new puzzles do NOT require any Java applets. We have a word search puzzle and our newly-added crosswords, with three levels of difficulty. All resources are interactive, engaging, and include a timer. Solutions are also provided. Choose a puzzle below to get started. Be sure to try our related activities, too!

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Related Activities on Decimals |

Unit on Adding & Subtracting Decimals |

Decimal Worksheets |

Decimal Dance Game |

### Featured Add and Subtract Decimals Vocabulary Words On These Puzzles

**Addend** – An addend is a number that is added to another number in an addition operation. For example, in the expression 5 + 3, both 5 and 3 are addends.

**Addition** – Addition is a mathematical operation that combines two or more numbers to find their total or sum. It is represented by the plus sign (+) and is one of the fundamental arithmetic operations.

**Carry** – Carry is the process of transferring a digit from one place value to the next higher place value when the sum of digits in the current place value exceeds the base of the number system. It occurs during addition, especially when adding multi-digit numbers.

**Decimal Point** – The decimal point is a punctuation mark used to separate the whole number part from the fractional part in decimal numbers. It is placed to the right of the ones place and is crucial for indicating the magnitude of decimal fractions.

**Decimal** – A decimal is a number expressed in the base-10 numerical system, consisting of a whole number part and a fractional part separated by a decimal point. It allows for the representation of fractions and real numbers with greater precision than whole numbers alone.

**Difference** – Difference is the result of subtracting one number from another in a subtraction operation. It represents the distance between two quantities or the amount by which one quantity is greater or lesser than another.

**Estimation** – Estimation is the process of approximating or making a rough calculation of a quantity or value without exact precision. It is commonly used to quickly assess the reasonableness of answers in mathematical operations, including addition and subtraction.

**Integer** – An integer is a whole number that can be positive, negative, or zero, without any fractional or decimal parts. Integers are used in arithmetic operations, including addition and subtraction, and represent counts or quantities.

**Minuend** – The minuend is the number from which another number is subtracted in a subtraction operation. For example, in the expression 10 – 3, 10 is the minuend.

**Negative** – Negative is a term used to describe numbers less than zero in value. In the context of addition and subtraction, negative numbers represent decreases or subtractions from a reference point.

**Number Line** – A number line is a graphical representation of numbers arranged in sequential order along a straight line, typically with zero at the center and positive numbers to the right and negative numbers to the left. It is used to visualize numerical relationships and perform arithmetic operations such as addition and subtraction.

**Overflow** – Overflow occurs when the result of an arithmetic operation exceeds the capacity or range of representation for a given number system, leading to inaccuracies or errors in computation. It commonly happens during addition or multiplication of large numbers.

**Place Value** – Place value is the value assigned to a digit based on its position within a number relative to the decimal point. Each digit’s place value is determined by its position, such as units, tens, hundreds, and so on.

**Positive** – Positive is a term used to describe numbers greater than zero in value. In the context of addition and subtraction, positive numbers represent increases or additions to a reference point.

**Regrouping** – Regrouping, also known as borrowing or carrying, is the process of exchanging values between different place values during addition or subtraction to ensure proper computation. It involves borrowing from higher place values or carrying over to lower place values as needed.

**Round Down** – Round down is the process of approximating a number to the nearest lower value, typically indicated by moving toward zero on the number line. It is used in rounding operations where the decimal portion of a number is truncated.

**Round Up** – Round up is the process of approximating a number to the nearest higher value, typically indicated by moving away from zero on the number line. It is used in rounding operations where the decimal portion of a number is increased to the next whole number.

**Rounding** – Rounding is the process of approximating a number to a specified place value or decimal position. It involves adjusting the value of the least significant digit based on the value of the next digit.

**Subtraction** – Subtraction is a mathematical operation that finds the difference between two numbers or quantities. It is represented by the minus sign (-) and is the inverse operation of addition.

**Subtrahend** – The subtrahend is the number subtracted from another number in a subtraction operation. For example, in the expression 10 – 3, 3 is the subtrahend.

**Sum** – Sum is the result of adding two or more numbers together in an addition operation. It represents the total or combined value of the numbers being added.

**Underflow** – Underflow occurs when the result of an arithmetic operation is smaller in magnitude than the smallest representable value in a given number system. It commonly happens during subtraction or division of very small numbers.

**Whole Number** – A whole number is a non-negative integer, including zero, that does not have any fractional or decimal parts. Whole numbers are used in arithmetic operations and represent counts or quantities.

**Zero** – Zero is the integer that represents the absence of quantity or value. It serves as the neutral element in addition and subtraction operations, where adding zero to a number leaves it unchanged and subtracting zero from a number yields the same value.

**Zero Pair** – A zero pair refers to a pair of numbers, one positive and one negative, whose sum equals zero. It illustrates the concept of additive inverses and demonstrates the relationship between positive and negative numbers on the number line.