Questions and Answers
What are math problems expressed in words and sentences called?
Word problems
Which of the following phrases indicates a subtraction operation in word problems?
Take away
What is the process in subtraction where a place value borrows from the place value to the left in order to subtract?
Regrouping
In the problem 252 - 146, what needs to happen to the ones place during subtraction?
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Which of the following is NOT a common signal for subtraction in word problems?
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What is the sum of 11 and 13 in Example 1?
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Which signal word indicates a subtraction problem in Example 2?
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How should the subtraction problem in the Challenge Example be set up?
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What is the minuend in the subtraction problem of the Challenge Example?
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In which step of solving addition and subtraction word problems is regrouping most likely to occur?
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Study Notes
Types of Math Problems
- Math problems can be written in words and sentences, known as word problems
- Word problems can be translated into algebraic expressions to be solved mathematically
Subtraction Word Problems
- Subtraction word problems involve math problems written in words and sentences that indicate subtraction
- Signal words that indicate subtraction include less, reduced by, difference, remain, fewer, and take away
- Regrouping (or borrowing) may be necessary when subtracting 2-digit or larger numbers
Subtraction with Regrouping
- Regrouping is the process of borrowing from the place value to the left to subtract
- Regrouping may occur over multiple columns
Addition Word Problems
- Addition word problems involve math problems written in words and sentences that indicate addition
- Signal words that indicate addition include more, increased by, sum, plus, altogether, total, and combined
Common Signal Words
- Table identifying addition and subtraction signal words: • Addition: more, increased by, sum, plus, altogether, total, combined • Subtraction: less, reduced by, difference, remain, fewer, take away
Solving Word Problems
- Step 1: Identify signal words to determine if the problem involves addition or subtraction
- Step 2: Determine minuend, subtrahend, and difference (for subtraction), or addends and sum (for addition)
- Step 3: Write values in numeric form with addition or subtraction and equal symbols
- Step 4: Solve the problem to calculate the unknown value
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