I love having a theme and focus! Recently I’ve written several posts about number talks and mental strategies for computation. Check out Adding on a 120 Chart, Exploring Addition Strategies, and More Mental Math Strategies. So far, I haven’t really talked about the kiddos showing their thinking on paper–something that could be used for independent practice. What I came up with was this little freebie for showing addition on a hundred chart. There is one sheet with numbers included and another with spaces so you can add your own numbers. Then I created two more versions with space for kiddos to show their work on an open number line, like I’ve shown in the photograph below. Now, keep in mind that there is not a right way to show the work. I jumped down 20, split the 8 into 7 and 1, used the 7 to jump from 73 to 80, and then added the 1 to get 81. Another child might split the 8 first, use 7 to jump from 53 to 60, jump down 20 to 80 and add the 1 to get 81. Yet another strategy would be to jump down 30 (a friendly number for 28) from 53 to 83, and then come back 2 to 81.
Recording Addition on a Hundred Chart
Written by Donna Boucher
Donna has been a teacher, math instructional coach, interventionist, and curriculum coordinator. A frequent speaker at state and national conferences, she shares her love for math with a worldwide audience through her website, Math Coach’s Corner. Donna is also the co-author of Guided Math Workshop.
Click here to grab your freebie. I’d love your feedback on this, so be sure to leave a comment!