Mr. Nogar's Class Writes!

October 23, 2011

Explaining 3 Digit Addition in Writing

Filed by mrnogar at October 23rd, 2011 under We Learn Some Math, Too!
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Explaining 3 Digit Addition in Writing

This student did not get to finish writing all the steps but his thinking is visible. We are trying to train ourselves to think and say “4 tens plus 9 tens makes 13 tens rather than simply 4 + 9 = 13, but the result here is the same. We will continue to emphasize when we are working with ones, tens, hundreds, or thousands to deepen our understanding.

Filed by mrnogar at October 23rd, 2011 under Uncategorized, We Learn Some Math, Too!
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Explaining 3 Digit Addition in Writing

J prefers to solve using hundred boxes, ten sticks, and ones circles rather than using a numerical method. His first answer was incorrect so I let him know he was close and asked him to check his work again. Notice also that he has written 90 tens instead of 9 tens which is very common. When all is said and done however, he was able to find his error and correct his work which is a very important mathematical skill to have.

Filed by mrnogar at October 23rd, 2011 under We Learn Some Math, Too!
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Explaining 3 Digit Addition with Dollars, Dimes, and Pennies

Everyone gathers around to watch G show how to add two dollar amounts. She needs a little time and a few prompts but she is eventually successful.

Filed by mrnogar at October 23rd, 2011 under We Learn Some Math, Too!
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October 22, 2011

Explaining 3 Digit Addition with Proof Drawing

This time J adds two three-digit number using the new groups above method. In his proof drawing he shows how he made a new ten with his ones. Perfect.

Filed by mrnogar at October 22nd, 2011 under We Learn Some Math, Too!
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October 20, 2011

Explaining 3 Digit Addition Using Dollars, Dimes, and Pennies

A needs a little help as he shows how to add these two dollar amounts. Notice that he counts his dimes correctly at first but doesn’t move them all over together. He then needs prompting to combine his pennies and dimes. When he combines his dimes he again leaves some of them behind when exchanging ten for a dollar. After we finished recording I noticed the error and asked him to add the two amounts numerically. Then he was able to identify his error.

Filed by mrnogar at October 20th, 2011 under We Learn Some Math, Too!
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Explaining 3 Digit Addition using Dollars, Dimes, and Pennies

In this video C counts out the two dollar amounts using dollars, dimes and pennies. He exchanges ten pennies for a dime and ten dimes for a dollar then counts everything to find the total. Well done.

Filed by mrnogar at October 20th, 2011 under We Learn Some Math, Too!
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Explaining 3 Digit Addition with Proof Drawing

Warning: The sound on this video is very quiet so you’ll probably want to grab your headphones.

Watch as E adds two three-digit numbers to make a four-digit number. She shows her regrouping with the new groups below method. In her proof drawing she circles 10 hundred boxes to show how she made one thousand and 10 circles to show the new ten.

Filed by mrnogar at October 20th, 2011 under We Learn Some Math, Too!
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October 19, 2011

Explaining 3 Digit Addition with Proof Drawing

M explains how she added 2 three digit numbers where she needed to regroup ones into a ten and tens into a hundred. In her proof drawing she circles 10 ones to show a new ten and 10 tens to show a new hundred. The sound is also soft on this post, so grab your headphones.

Filed by mrnogar at October 19th, 2011 under We Learn Some Math, Too!
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October 18, 2011

Explaining 3 Digit Addition with Proof Drawing

In this screencast, a Z adds two 3 digit numbers. He shows his work numerically grouping to make a new ten and a new hundred and showing them with the new groups below method. He then creates a proof drawing to check his work. Each box drawn represents one hundred, each stick a ten, and each dot or circle a one. He notices and tries to correct his error when he draws one too many ones for 636 and then circles to show the new groups he created. Great job!

The sound is a little soft in this video so you may want to plug in some headphones.

Filed by mrnogar at October 18th, 2011 under We Learn Some Math, Too!
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