February 1, 2016
Dear Bighorns,
Miss Garcia and myself can't believe we just changed the calendar pieces from January to February!! How can we be done with the first calendar month of the year???
In math 2nd grade students have been working very hard using previously learned strategies (open number line-last week and branch models-this week) renaming the ones and tens to add and subtract within one thousand. This work involves a lot of decomposing and composing of numbers. Students are showing their ability with number flexibility as they are catching on very quickly.
Examples from last week…
Addition
450 + 90 = ___ 1. The next hundred after 450 is 500.
↙ ↘ 2. To get to 500 you need 50, so the 90 get decomposed into 50 and 40.
50 40 3. The renamed equation is 500 + 40 = 540.
500 + 40 = 540 4. Check by using the open number line.
Subtraction↔
56 - 7 = ____ 1. The last ten before 56 is 50.
↙ ↘ 2. To get to 50 you need to subtract 6, so the 7 gets decomposed into 6 and 1.
6 1 Then take the 6 and subtract it from the 56 to make 50.
56 -6 = 50 3. The renamed equation is 50 - 1 = 49.
50 - 1 = 49 4. Check by using the open number line.
Examples for this week…
Renaming the ones.
606 + 145 = 1. Decompose addends by place value.
↙↓↘ ↙↓↘ 2. Group hundreds. Group tens. Group ones.
600 0 6 100 40 5 3. Add hundreds. Add tens. Add ones.
(600 + 100) + (0 + 40) + (6 + 5) 4. Decompose the ones place to rename.
700 + 40 + 11 5. Write and solve renamed equation.
↙ ↘
10 1
700 + 50 + 1 = 751
Renaming the tens.
256 + 371 = 1. Decompose addends by place value.
↙↓↘ ↙↓↘ 2. Group hundreds. Group tens. Group ones.
200 50 6 300 70 1 3. Add hundreds. Add tens. Add ones
(200 + 300) + (50 + 70) + (6 + 1) 4. Decompose the tens place to rename.
↙ ↘ 5. Decompose the tens place to rename hundreds place.
20 30 6. Write and solve renamed equation.
500 + 120 + 7
↙ ↘
100 20
600 + 20 + 7 = 627
Homework
Due to our work in math over the next couple of weeks, 2nd grade homework for this week will be worksheets.
Valentine’s Day
Since Valentine’s Day falls on a Sunday this year, Oasis Academy will not be holding parties for Valentine’s Day or having students pass out Valentines. With Valentine’s Day included in the long President’s Day Weekend, Oasis families are encouraged to celebrate Valentine’s Day with their families.
With the crazy (but fun) weather this weekend, we’re hoping that the upcoming week warms up a bit.
Sincerely,
Mrs. Bloomfield
and
Miss Garcia
