Created by V. S. Bell H. H. Beam Elementary School Gastonia, NC 28052

Let’s subtract! Subtract means to take away!

Use the EOG grid paper for student work. Ask students to practice along with the PowerPoint. Give students the quiz problem at the end for assessment. Then, show the correct work.

Let’s subtract! Subtract means to take away! How many more? How many left? Difference? Have left?

Let’s subtract! Subtract means to take away! X = 10 Tens Row = 1 Ones Row = 100 Hundreds Row Remember: Largest number goes first!

Problem # = n

Step #1. Show how many you have in the beginning = n 500 XXXXX HTOHTO

Step #2. Subtract the number of hundreds = n 1 XXXXX HTOHTO

Step #2. Subtract the number of hundreds = n 1 XXXXX HTOHTO

Step #3a: Subtract the number of tens = n 3 XXXXX HTOHTO

Step #3b: Are there any tens showing? = n XXXXX NO! Please regroup! HTOHTO

Step #3c: Circle one hundred and draw marks for 10 tens? = n XXXXXX HTOHTO

Step #3d: Mark out the number of tens? = n 3 XXXXXX HTOHTO

Step #4a: Subtract the number of ones? = n 7 XXXXXX HTOHTO

Step #4b: Are there any ones showing? = n XXXXXX HTOHTO NO! Please regroup!

Step #4c: Circle 1 ten and make marks for 10 ones = n XXXXXX HTOHTO

Step #4d: Mark out the number of ones = n 7 XXXXXX HTOHTO

Step #5: How many hundreds do you have left? = XXXXXX 3 3 HTOHTO

Step #6: How many tens do you have left? = XXXXXX 6 36 HTOHTO

Step #7: How many ones do you have left? = XXXXXX HTOHTO

Congratulations! You have subtracted across zeroes with regrouping! XXXXXX 363 HTOHTO

Problem # = n

Step #1. Show how many you have in the beginning. 700 XXXXX HTOHTO = n XX

Step #2. Subtract the number of hundreds. XXXXX HTOHTO = n XX

Step #3a: Subtract the number of tens. 4 XXXXX HTOHTO = n XX

Step #3b: Are there any tens showing? XXXXX NO! Please regroup! HTOHTO = n XX

Step #3c: Circle one hundred and draw marks for 10 tens? XXXXX HTOHTO XX = n X

Step #3d: Mark out the number of tens? 4 XXXXX HTOHTO = n XXX

Step #4a: Subtract the number of ones? 6 XXXXX HTOHTO = n X

Step #4b: Are there any ones showing? XXX NO! Please regroup! HTOHTO XXX = n

Step #4c: Circle 1 ten and make marks for 10 ones. XXXX HTOHTO XX = n

Step #4d: Mark out the number of ones. 6 XXXX HTOHTO = n XX

Step #5: How many hundreds do you have left?. XXX 4 4 HTOHTO = XXX

Step #6: How many tens do you have left?. XXX 5 35 HTOHTO = XXX

Step #7: How many ones do you have left?. XXXXX HTOHTO XX =

XXXXX 454 HTOHTO XX Congratulations! You have subtracted across zeroes with regrouping!

Time for a Quiz = n

To Be Continued...