Decomposing to Subtract from a 10 (When Subtracting within 20)

Tonight’s homework is understanding HOW to decompose or break apart numbers in subtraction. Monday we go into more difficult equations, so it is important that we get a good foundation of this concept now. Just a heads up: students are not required to use number bonds on tonight’s homework, but they will be doing this on Monday.

The homework is divided into three sections: solving simple subtraction problems, write the missing addends, and a couple story problems.

The first section asks you to circle the number sentence if you must subtract from the 10. We learned in class that you need to subtract from either the ones or the tens. For example, in the equation 14-3, I need to either subtract from the ones or the tens. If I can subtract 3 from 4 (which I can), then I don’t need to worry about taking any from the ten. But if my equation is 13-6, and I can’t take 6 away from the number in the ones place (3), then I have to take it away from the 10. If I have to take away from the ten, please circle the number sentence. Feel free to use other subtraction strategies such as a number line, touch dots, or mental math to help find the answer- kiddos just need to know if they can subtract the ones without breaking apart a 10.

The second section of the homework asks the students to fill in the blank to make the number sentence correct. Students will need to use addition strategies to solve the first side of the equation, and then try and figure out the number that is missing that will make the equation balance out.

The third section of the homework is story problems. I would like students to use the RDW method to solve these problems. RDW stands for READ, DRAW & LABEL, and WRITE the NUMBER SENTENCE. I don’t just want to see the answer! I want to see how students are solving the problem so I know that they understand why 11-5 = 6.

Please let me know if you have any questions!

Happy Learning!!!

Cracker Science & Math Review

I just wanted to share our learning today in science! We did a few experiments with crackers to see the effect our saliva has on our taste and how it prepares our food for the digestive process. We also learned about PERISTALSIS which basically is the muscles pushing our food down the esophagus even when we are laying down. We laid down and took bites of a cracker and sure enough- the food went down our esophagus! We even talked a little about reverse peristalsis- any one want to guess what that means? 🙂

Today in math we reviewed our learning on addition with number bonds. I went through the homework and the problem sets we worked on during class and wrote some homework sheets for tonight for you to download. There are 3 levels of homework- Level 1 for those kids who are having a really hard time with number bonds, Level 2 is average and the level where I expect most of my kiddos to be at, and Level 3 is more challenging. Choose the level that works best for your child- please don’t try and overwhelm them with the more difficult work if they are struggling to understand. Tomorrow we start our lessons on subtraction with number bonds which looks pretty tricky! I will try and have our power points up so you can watch them with your child.

Let me know if you have any questions or concerns. We are off to a great year!