Making a model can help us solve subtraction problems. We can use base 10 blocks, or draw a quick picture of blocks to help us model the action in a subtraction problem. The "action" in a subtraction problem is what happened. It's what went away, was taken away, eaten, used, and so on. The action could be comparing amounts to find their difference. We solve 5 word problems that involve quick pictures to solve 3-digit subtraction. 2nd Grade Math 6.3, 3-digit Addition, Regroup Ones https://youtu.be/84iFm_uOhpc 2nd Grade Math 6.4, 3-digit Addition, Regroup Tens https://youtu.be/cgKPZ_TzIg0 2nd Grade Math 6.5, 3-digit Addition, Regroup Ones and Tens https://youtu.be/I21Bf3z5h4g 2nd Grade Math playlist: https://www.youtube.com/playlist?list=PLKi4WTp6PRGUL-MlUdbT5DeAsigMuQc4o I'm using the Houghton Mifflin Go Math! 2015 copyright textbook for this playlist. You can practice online using the textbook's website https://www.gomathacademy.com/ This video and its contents are the property of JoAnn's School and is protected under U.S. copyright law. FOLLOW ME: TWITTER https://twitter.com/JoannsSchool FACEBOOK https://www.facebook.com/JoAnnsSchool/ MINDS https://www.Minds.com/joannsschool SUPPORT MY WORK: PATREON (monthly) https://www.patreon.com/JoannsSchool PAYPAL (one time) https://www.paypal.me/JoAnnsSchool ... https://www.youtube.com/watch?v=oXNA5nn5vME

To find decimal sums and differences, we can use mental math and properties, pencil and paper, or a calculator. The Commutative Property of Addition lets us change the order of two addends. We'll get the same sum. The Associative Property of Addition lets us change the way addends are grouped. We can use mental math to add decimals if we use the Commutative and Associative Properties of Addition. When we add decimals by using place value and regrouping, we add them just as we would add whole numbers. But, we must line up the decimal points. We show many different types of calculators. But any calculator can solve addition, subtraction, multiplication, or division. To add or subtract decimals on a calculator, we push a key for each part of the equation. The sum or difference will appear on the screen. But, using our brain power will strengthen our math skills. Be careful when using a calculator! If we accidentally push the the wrong key, we will get a wrong answer. We can estimate the sum or difference to be sure our answer is reasonable. We can also use the calculator a second time to see if we get the same answer. Sometimes mental math or paper and pencil will be faster than using a calculator. The Commutative and Associative properties cannot be used for subtraction because they change the order of the digits. The minuend needs to be first. Remember, we can use trailing zeros to the right of a decimal to give it more digits so we can regroup. We can use an inverse operation to solve for an unknown amount, such as a variable, or to check our answer. We solve an equation in which we first find the sum of the addends that we know, then use subtraction to find an unknown amount. We solve a word problem that involves addition and subtraction of decimals. 5th Grade Math Playlist https://www.youtube.com/playlist?list=PLKi4WTp6PRGX8NtQpzliTlMceQT1ua24f I'm using the Houghton Mifflin Go Math! 2015 copyright textbook for this playlist. You can practice online using the textbook's website https://www.gomathacademy.com/ YouTube rating for JoAnn's School videos: L0 - No strong language N0 - No nudity S0 - No sexual situations V0 - Not violent or disturbing D0 - No drug reference or content F0 - No flashing lights content FOLLOW ME: SUBSCRIBE on YouTube https://www.youtube.com/c/JoAnnsSchool TWITTER https://twitter.com/JoannsSchool FACEBOOK https://www.facebook.com/JoAnnsSchool/ MINDS https://www.Minds.com/joannsschool PATREON https://www.patreon.com/JoannsSchool SUPPORT MY WORK: PATREON (one time or monthly) https://www.patreon.com/JoannsSchool PAYPAL (one time) https://www.paypal.me/JoAnnsSchool ... https://www.youtube.com/watch?v=86xnFVqSEGQ