We are working on being more comfortable using open number lines in Math.
We use open number lines
- to show our thinking
- to become more efficient, rather than adding or subtracting one number at a time
- as a tool to add and subtract to 100
- because students will continue to use open number lines in future grades
- because the district includes open number lines in its Numeracy assessments
Today, when students added and subtracted on our windows, they also included using an open number line to show their solution. Here are some photos of examples:
4 + ? = 12
Jump to a friendly number, 10. Then jump to 12. Add your jumps together: 6+2=8, so 4+8=12.
10-4=?
We are looking for the difference, so we can solve 4+?=10.
We have learned to make 10 this year, so 4+6=10!
We will be subtracting lots of big numbers in the Spring.
We can use a number line to subtract big numbers:
92-38=?
On a number line, start at 38 and jump (but not one at a time) until 92!
Saying numbers in French is still difficult for many students. We are singing along with Alain le Lait songs (check out the “songs” tab on the blog, or looks for Alain le Lait number songs on Youtube). In April, I will send home a number chart, the numbers 1-100 written in words IN FRENCH home so you can support your child. Because we learn Math in French, students who cannot say their numbers get very confused when we are working with other concepts.
Some things to watch for: mixing up 6 and 9, mixing up 14 and 41, and with 80 being “quatre-vingts” (4 20s) in French, this can be confused with 24. Students will be working with numbers to 1000 in grade 3, so your support with numbers in grade 2 will be invaluable!