“Subtract One” Strategy: Subtracting From Zeros Without Borrowing
Many students cringe when they see a subtraction problem with multiple zeros. The “Subtract One” strategy in this lesson involves reducing the top number by one to turn the 0 digits into 9’s and then adding the one back in at the end.
In this lesson, students must become detectives to solve for the missing number in each subtraction problem. They will develop and use their powers of mathematical reasoning using number bonds to find differences.
Get your students comfortable with discussing multiple strategies to solve subtraction problems with this lesson on two- and three-digit subtraction. It may be taught independently or as support for the lesson Subtraction with Regrouping.
Master rounding and estimating skills by having students challenge their classmates in the Make a Big Difference game. Roll three dice two times to arrive at two three-digit numbers. The largest difference wins!
What exactly does the number 97 mean? How about 454? In this lesson, students explore how two-digit numbers are made up of tens and ones. Then they use this understanding to subtract numbers within 1000.
Use this lesson to help students build their speaking and listening skills as they learn how to critique a flawed response using discussion cards. Use this as a stand-alone support lesson or alongside the activity Break it Down!
Word problems can be overwhelming to students, but if they have a tool to help them, they can handle it! Use this as a stand alone lesson or alongside *Stepping Through Addition and Subtraction Word Problems*.
In this lesson, students will practice explaining the process of subtracting numbers up to 1,000 using base-ten blocks and peer feedback. Use this lesson on its own or as support to the lesson Fluently Subtracting within 1,000.