Complete the addition or subtraction sentence

Learning Objectives Identify missing numbers in decimal addition sentences. Identify missing numbers in decimal subtraction sentences. Apply inverse operations to solve for missing addends. Apply inverse operations to solve for missing subtrahends. Apply inverse operations to solve for missing minuends. Accurately add and subtract multi-digit decimals. Check the reasonableness of their solutions in decimal sentences. Ever wonder how detectives solve mysteries? 🕵️‍♀️ Just like them, you'll learn to find the missing pieces in math puzzles involving decimals! In this lesson, you'll become a math detective, learning to complete addition and subtraction sentences that involve decimals. We'll discover how to find the unknown numbers, making you super skilled at s...

TermDefinitionExample DecimalA number that uses a decimal point to show parts of a whole, representing fractions with denominators that are powers of ten (e.g., tenths, hundredths).3.5 (three and five tenths) or 0.75 (seventy-five hundredths). Addition SentenceA mathematical statement showing that two or more numbers (addends) are combined to get a total (sum).2.3 + ⬜ = 5.8 Subtraction SentenceA mathematical statement showing that one number (subtrahend) is taken away from another (minuend) to find the difference.7.1 - ⬜ = 3.2 Inverse OperationsOperations that undo each other. Addition is the inverse of subtraction, and subtraction is the inverse of addition.To solve ⬜ + 2 = 5, you use the inverse operation: 5 - 2 = 3. MinuendThe first number in a subtraction problem, from which anothe...

Finding a Missing Addend If $a + \text{⬜} = c$ or $\text{⬜} + b = c$, then $\text{⬜} = c - a$ (or $c - b$). To find a missing addend in an addition sentence, subtract the known addend from the sum. This uses the inverse operation of addition. Finding a Missing Subtrahend If $a - \text{⬜} = c$, then $\text{⬜} = a - c$. To find the missing subtrahend (the number being subtracted) in a subtraction sentence, subtract the difference from the minuend. This also uses the inverse operation. Finding a Missing Minuend If $\text{⬜} - b = c$, then $\text{⬜} = c + b$. To find the missing minuend (the number you start with) in a subtraction sentence, add the subtrahend and the difference. This uses the inverse operation of subtraction.