Mathamatics

During second grade, we will have many opportunities to solve different problems.

Here are a few types of problems and different ways to solve them.

I hope this helps.

------------------------------------------------------------------------------------------------------------------------------------

How about Odd and Even Numbers?

click here: Odd Even #'s , to see information on them!

-----------------------------------------------------------------------

Missing Number & Subtraction Problem Strategies

Sally had 35 pennies. On her way to the store she lost some of her pennies. Now she 18 pennies. How many pennies did she lose?

-----------------------------------------------------------------------------------

Missing Number type problems are subtracting problems when part of the story is missing?

In this story, Sally loses some pennies . She started with 35 .

At the end she has 18 .

The missing number is “How many did she lose?” the (missing part)

There are different ways you can solve missing number problems!

Counting Back Counting Up

35 - _?_ = 18 18 + _?_ = 35

A. 35 - 5 = 30 A. 18 + 2 = 20

B. 30 - 10 = 20 B. 20 + 10 = 30

C. 20 - 2 = 18 C. 30 + 5 = 35

---------------------- -------------------

Now, add up the "jumps".

10 + 5 + 2 = 17 10 + 5 + 2 = 17

? = 17 ? = 17

Sally lost 17 pennies. Sally lost 17 pennies.

---------------------------------------------------------------

Click here to see...

Or, you can simply subtract.

35 - 18 = ?

10 8 decompose the part...18 into a 10 & 8

subtract 35 - 10 = 25

subtract 25 - 8 = 17

Start at 25, count back 8.

(17 , 18, 19, 20, 21, 22,23, 24, 25 ) When you do this..you reach 17!

Sally still lost 17 pennies.