by C. Elkins, OK Math and Reading Lady
Welcome back to Part 3 of my Ten Frame series. This will continue with some more ideas on using ten frames for addition and place value. Be sure to grab my free set of mini ten frame dot cards and Place value mat with ten frames to use with these activities.
How often do you see students counting their fingers, drawing tally marks, or other figures to add 9? But what if they could visualize and conceptualize adding 9 is almost like adding ten, but one less? This is where the ten frame comes in handy.
- To be most efficient with adding 9, help students to add 10 (or a multiple of 10) to any single digit. Example: 10 + 7, 20 + 4, 50 + 8 . . .
- Show a problem such as 9 + 7 as part of your daily Number Talk. Observe and listen to how students are solving.
- Introduce this strategy by showing two ten frames – one with 7 and the other with 9. Check for quick recognition (subitizing) of these amounts on each ten frame.
- Move one counter from the ten frame with 7 to the ten frame with 9. This will complete it to a full ten frame. Then add 10 + 6 mentally.
- The purpose is for students to visualize that 9 is just one away from 10 and can be a more efficient strategy than using fingers or tally marks.
- Practice with several more +9 problems.
- For 3rd and up try mental math problems such as 25 + 9 or 63 + 9. Then how about problems like 54 + 19 (add 20 and take away one)?
- Can students now explain this strategy verbally?
- Let’s say you had the problem 14 -9. Show 2 ten frames, one with 10 and one with 4 to show 14.
- To subtract 9, focus on the full ten frame and show that removing 9 means almost all of them. Just 1 is left. I have illustrated this by using 2 color counters and turning the 9 over to a different color.
- Combine the 1 that is left with the 4 on the second ten frame to get the answer of 5.
- Looking at the number 14, I am moving the 1 left over to the one’s place (4 + 1 = 5). Therefore 14 – 9 = 5
Use of the ten frame provides a concrete method (moving counters around) and then easily moves to a pictorial method (pictures of dot cards). These experiences allow students to better process the abstract (numbers only) problems they will encounter.
Place Value Concepts: Continue reading