Mathematics
Grade 5
15 min
Subtract multiples of 10
Subtract multiples of 10
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Identify multiples of 10.
Subtract multiples of 10 from other multiples of 10 using mental math strategies.
Subtract multiples of 10 from any two- or three-digit whole number.
Apply place value understanding to accurately subtract multiples of 10.
Perform subtraction of multiples of 10 using the standard algorithm, including regrouping.
Solve real-world word problems involving the subtraction of multiples of 10.
Ever wonder how quickly you can calculate how much money you have left after spending some? 💰 This lesson will teach you a super-fast way to subtract numbers ending in zero!
In this lesson, you'll learn effective strategies for subtracting multiples of 10 from various whole numbers. Mastering this skill will not only boost your mental math...
2
Key Concepts & Vocabulary
TermDefinitionExample
Multiple of 10A number that can be divided by 10 with no remainder. These numbers always end in a zero.10, 20, 30, 40, 50, 60, 70, 80, 90, 100, etc.
Place ValueThe value of a digit based on its position in a number. For example, in the number 72, the '7' is in the tens place and represents 70, and the '2' is in the ones place and represents 2.In 120, the '1' is in the hundreds place, the '2' in the tens place, and the '0' in the ones place.
SubtractionThe process of taking one number or quantity away from another. It tells us the difference between two numbers.If you have 5 apples and eat 2, you perform 5 - 2 = 3 apples left.
Mental MathPerforming mathematical calculations in your head without the use of paper, pencil...
3
Core Formulas
Subtracting Multiples of 10 from Multiples of 10
$A imes 10 - B imes 10 = (A - B) imes 10$
When subtracting one multiple of 10 from another multiple of 10, you can simply subtract the 'tens digits' and then multiply the result by 10. The ones digit will always remain 0.
Mental Math Strategy: Subtracting Tens
To subtract a multiple of 10 from a whole number, focus on the tens place of both numbers. Subtract the tens digit of the subtrahend from the tens digit of the minuend. The ones digit of the minuend usually remains the same, unless regrouping affects it.
This strategy is useful for quick calculations. For example, to solve $75 - 30$, think: '7 tens minus 3 tens is 4 tens.' So, $75 - 30 = 45$ (the 5 in the ones place stays the same).
Standard Al...
5 more steps in this tutorial
Sign up free to access the complete tutorial with worked examples and practice.
Sign Up Free to ContinueSample Practice Questions
Challenging
Which of the following word problems could be solved using the equation 172 - 80 = 92?
A.Jada had 172 stickers and got 80 more. How many does she have now?
B.Tom ran 172 meters and then ran another 92 meters. How far did he run in total?
C.store had 172 video games. It sold 80 of them. How many are left?
D.There are 172 students in 5th grade and 80 in 4th grade. How many more students are in 5th grade?
Challenging
To mentally solve 345 - 90, a student thinks: 'I'll subtract 100 first, which is 245, and then add 10 back.' Why is this an effective strategy?
A.It's not effective because it involves addition.
B.It's a common mistake that gives the wrong answer.
C.It's effective only for numbers ending in 5.
D.It uses a 'friendly' number (100) to make the initial subtraction easier, then adjusts to get the correct answer.
Challenging
Store A has 450 shirts and sells 80. Store B has 380 shirts and sells 20. What is the difference in the number of shirts remaining at each store?
A.10
B.20
C.30
D.40
Want to practice and check your answers?
Sign up to access all questions with instant feedback, explanations, and progress tracking.
Start Practicing Free