Math Night 2014

• 23 + 15 28 + 50 How did you get your answer?

Each day students practice adding and subtracting strategies mentally with Number Talks.Students discuss various ways to achieve the answer.

Word ProblemsThere are fifteen problem solving situations that second gradersare expected to solve by the end of second grade. This standard was started in Kindergarten and continues in first and second grade.

Problem Solving Steps

Read the Problem (2 times)

Think about what the problem is asking you to do

Doodle Math (Draw a quick sketch of the problem)

Write the equation2 + 3 = _____ 5 – 2 = ____

_____ + 3 = 5 5 - ______ = 3

2 + _____ = 5 _____ - 2 = 3

Solve the problem and check your work. Does your answer make sense?

Number line Strategy

• 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

• One strategy for solving problems is an open number line.

27 + 13

27 37 38 39 40 OR 27 28 29 30 40

Students are expected to add missing number to a number line. In addition, Use the number line to solve addition and subtracting problems.

Now You Try...

• 60 apples were on the shelf. 23 apples were sold. How many apples are on the shelf now?

• 51+28=

516 is the same as

+ +Mrs. Mims ‘ class read 516 pages in the month of October. Mrs. Alley’s class read 234 pages. How many pages did they read together?

Using expanded form to add

516= 500 + 10 + 62 34 = 200 + 30 + 4_______________ 700 + 40 + 10 = 750

Another adding strategy-Arrow overJoy has a collection of 53 seashells. Mark has a collection of 21 seashells. How many seashells do they have together?53 + 10 +10 + 1

53 63 73 74

Comparing 2 3-digit numbers

> < =100 10

1

234 > 179 Be able to explain how you know.

Students are expected to be able to make numbers 4 ways

Base ten numeral 213

Base ten blocks

Number words two hundred thirteen

Expanded form 200 + 10 + 3

******Important ******213 is also equal to 1 hundred 11 tens and 3 ones 21 tens and 3 ones

Counting Coins Students must be able to recognize and count coins. In addition they must be able to solve word problems using money.

Sam looked in his piggy bank. He had 2 quarters, 2 dimes, 2 nickels, and 6 pennies. How much does he have? How much more does he need to have one dollar?

Addition and Subtraction Fluency to 20

Progression Fluent to 5 by the end of Kindergarten.

Fluent to 10 by the end of first grade

Fluent to 20 by the end of second grade

Students must know these facts quickly without using their fingers or counters.

Skip counting forward and backward by 2s, 5s, and 10s.

Must be able to start with any number from 1-999

Example: 45, 55, 65, 75 88, 98, 108, 118

235, 225, 215, 205, 195 978, 878, 778, 678

Telling time Telling time to nearest 5 minutes.

Trickiest part is determining the hour when 35-55 minutes have past.