Subtract multiples of 10

Learning Objectives Identify multiples of 10 up to 1000. Subtract a multiple of 10 from any two-digit number. Subtract a multiple of 10 from any three-digit number. Use a number line to model subtracting multiples of 10. Apply place value strategies to mentally subtract multiples of 10. Solve one-step word problems that involve subtracting multiples of 10. If you have 90 building blocks and use 40 to build a tower, how many blocks are left for your next creation? 🏗️ In this lesson, you will learn a super-fast way to subtract numbers that end in zero, like 10, 20, 50, and 90. This is a very useful skill that helps you solve math problems quickly in your head and makes you a subtraction superstar! Real-World Applications Calculating how much money you have left after buyi...

TermDefinitionExample Multiple of 10A number you get when you count by 10s. These numbers always end in a zero.10, 20, 30, 40, 50, 60, 70, 80, 90, 100 SubtractionThe process of taking one number away from another to find out how much is left.80 - 30 = 50 DifferenceThe answer you get when you subtract one number from another.In the problem 75 - 20 = 55, the difference is 55. Place ValueThe value of a digit based on its position in a number (e.g., ones, tens, hundreds).In the number 263, the 2 is in the hundreds place (200), the 6 is in the tens place (60), and the 3 is in the ones place (3). Tens DigitThe number in the tens position, which tells you how many groups of ten are in a number.In the number 84, the tens digit is 8.

The Tens Place Rule When subtracting a multiple of 10, only the tens digit changes. The ones digit stays the same. Use this for quick mental math. Find the tens digit in the number you are subtracting from, and subtract the tens. The ones digit doesn't change because you are subtracting zero ones. The Basic Fact Rule To find 90 - 40, think '9 tens - 4 tens = 5 tens'. The answer is 50. Use your simple subtraction facts (like 9 - 4) and apply them to the tens place. This turns a big problem into a small, easy one. The Number Line Rule A - (B \\times 10) = \\text{Counting back B times by 10 from A} This helps you see the subtraction. To subtract 30, you start at your first number and make 3 jumps of 10 backwards on a number line. The number you land on is...