Subtract multiples of 100

Learning Objectives Identify multiples of 100 up to 1,000. Mentally subtract a multiple of 100 from another multiple of 100. Subtract a multiple of 100 from any three-digit number without regrouping. Use place value strategies to explain their subtraction method. Solve one-step word problems that involve subtracting multiples of 100. Check their subtraction answers using addition. Imagine you have a jar with 800 shiny marbles and you give 300 to your best friend. How many do you have left? 🤔 In this lesson, we will learn a super-fast trick for subtracting big numbers like 100, 200, and 300. This skill makes solving large math problems easier and helps you understand how numbers work together. Real-World Applications Calculating how much money is left after a purchase (...

TermDefinitionExample Multiple of 100A number you get when you multiply 100 by a whole number. These numbers always end in two zeros.100, 200, 300, 400, 500, 600... SubtractionThe process of taking one number away from another to find out how much is left.900 - 200 = 700 DifferenceThe answer you get when you subtract two numbers.In the problem 500 - 100 = 400, the difference is 400. Place ValueThe value of a digit based on its position in a number. We focus on the ones, tens, and hundreds place.In the number 842, the 8 is in the hundreds place and its value is 800. Hundreds PlaceThe position of the third digit from the right in a number.In the number 627, the digit 6 is in the hundreds place.

The Hundreds Digit Rule A00 - B00 = (A - B)00 When you subtract two multiples of 100, you only need to subtract the digits in the hundreds place. Then, just add the two zeros to the end of your answer. The 'Keep the Tens and Ones' Rule ABC - D00 = (A - D)BC When you subtract a multiple of 100 from any 3-digit number, only the hundreds place changes. The tens and ones digits stay exactly the same.