
Remember, you are only as successful as you want to be!I CHALLENGE you to do your best in everything you do!
WHAT WILL YOU DO TO BE SUCCESSFUL THIS YEAR?Teacher: Trish Horne
Email Address: phorne@effingham.k12.ga.usPhone number: 7283801New Math for Parents:New math: 65  27= 38You can solve many ways: Subtract 2 tens from 65 because thereare 2 tens in 27. 6520=45 Then subtract 7 ones from 45 becausethere are 7 ones in 27. 457=38 38 is your answer!65= 60+527= 20+7402=38 you get a negative number when you subtract 57Example: 67 + 25 = __
Place Value Strategy
I broke both 67 and 25 into tens and ones. 6 tens plus 2 tens equals 8 tens. Then I added the ones. 7 ones plus 5 ones equals 12 ones. I then combined my tens and ones. 8 tens plus 12 ones equals 92.
Counting On and Decomposing a Number Leading to Ten
I wanted to start with 67 and then break 25 apart. I started with 67 and counted on to my next ten. 67 plus 3 gets me to 70. Then I added 2 more to get to 72. I then added my 20 and got to 92.
Commutative Property
I broke 67 and 25 into tens and ones so I had to add 60 + 7 + 20 + 5. I added 60 and 20 first to get 80. Then I added 7 to get 87. Then I added 5 more. My answer is 92.
Students may solve this problem in a variety of ways. Examples are:
50  12
50 – 10 is 40, then 40 – 2 is 38.
50 – 2 is 48, them 48 – 10 is 38.
You need 8 more to get to 20 from 12, then 30 more to get to 50, so the answer is 8 + 30 or 38.Note: Students who use this method are actually finding the difference between the two numbersand not simply "taking away." This is a wonderful opportunity to discuss different approaches to subtraction.99 + 17
Students may solve this problem in a variety of ways. Examples are:99 and 1 more is 100, 100 + 17 is 117,but take 1 away that was added to the 99 to get 100, so the answer is 116.Some may attempt a traditional algorithm, but should notice that this is more cumbersome that examiningthe numbers and using the ideas above to compute.You can also use base ten blocks (models), number lines, & 99 charts to show subtractionand addition.Quick Links: Important new website below!!!!!Learn Zillion:www.georgiastandards.orghttp://www.orecity.k12.or.us/staff/curriculum_resources/mathematics/second_grade
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