Unit 2 Review

Money and Perimeter Review

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Coins

• A penny is worth 1¢. It takes 100 pennies to make a dollar.

• A nickel is worth 5¢. It takes 20 nickels to make a dollar.

• A dime is worth 10¢. It takes 10 dimes to make a dollar.

• A quarter is worth 25¢. It takes 4 quarters to make a dollar.

Multiple Choice

What is this coin?

• penny

• nickel

• dime

• quarter

Multiple Choice

Which image is a quarter?

Counting Money

• When counting money, start with the largest amount.

• Know how to skip count by 5, 10, and 25.

Multiple Choice

Which shows $7.57?

Multiple Select

Which of these show $21.67? Check ALL that are correct.

Adding and Subtracting

Word Problems

Look for words that help you know if you are putting things together or taking them apart.

Look at how many numbers are in the problem. More than two numbers means you have to do more than one thing.​

Sometimes you don't have to solve the problem. You just have to know HOW to solve the problem.​

Some text here about the topic of discussion

​Let's try a 2-step question

We need to look at the problem one step at a time.

There are 529 items in the school's lost-and-found. This is the total so it should be the big bar.

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​Some text here about the topic of discussion.

​Step One:

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Some items are jackets.

Some items are hats.

Some items are sweaters.

Altogether the 529 items. The three sections together should be the same size as the big bar. ​

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​Some text here about the topic of discussion.

​Step Two:

We need to add 265 plus 88.

​265 + 88 = 353

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Then we subtract 353 from 529.

​Some text here about the topic of discussion.

​Step Three:

​Are we adding all of the numbers or do we need to subtract?

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We are adding because he BOUGHT toys. He did not get rid of any. ​

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​Let's try another one...

Multiple Choice

Which answer choice adds all three numbers together?

• 880

• 1,132

• 824

​Estimating Sums and Differences

When we estimate we do not find an exact answer. We usually do this be rounding.

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Also remember sum is the answer to an addition problem and difference is the answer to a subtraction problem. ​

Subject | Subject

Some text here about the topic of discussion

​This means we need to round the numbers FIRST.

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​Notice how it asks for the best estimate?

That means we should round the numbers in the problem to the nearest 100.

​Some text here about the topic of discussion.

​See how all of the answer choices are hundreds?

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124 rounds to 100.

193 rounds to 200.

92 rounds to 100. ​

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​Round each number to the nearest 100.

Multiple Choice

• 200

• 500

• 300

• 400