Afvree came up with a NEW way to use mental math!
In class, we have been using multiple strategies to solve addition and subtraction problems with mental math. Students often decompose a number into tens and ones. For example, 96 is the same as 90 and 6.
Other students like to use what we call "Seldin's Strategy" where they recognized that adding 100 then taking away 4 is the same as adding 96.
Today, Ayvree discovered that we can decompose parts of numbers to do mental math! For example, when solving 86 more than 95. Looking at the 86: instead of breaking it into tens and ones she decided to break apart the 6 into 5 and 1. Then she looked at the 95. She broke the 90 into 80 and 10. She knew that 80 (from 86) plus 80 (from 95) is a doubles fact - 160. Then she added the 5 (from the 6 ones in 85) to 95 to get 10. Now she has 160 plus ten more is 170. Lastly, she added the extra 11 that she had left (10 from 95 and 1 from the six ones in 86) to get 181. Great job trying something new!
