Unit 1 Review

Unit 1 Review

Let's talk about all that we have learned!

Ten times rule

Every time you move to a larger place value, the value gets larger by 10.

If you move from the tens place to hundreds place, the hundreds place is 10 times larger than the tens.

If you move from the tens place to thousands place, the thousands place is 100 times larger than the tens, because 10 x 10 = 100.

Comparing Numbers

When comparing numbers, ALWAYS look at the greatest value first. 
In this image, the largest value is the hundred thousands place. 
Keep working your way down until you get two numbers that have different values. 
The first set of numbers has a 5 in the hundreds place and the second set of numbers has a 4 in the hundreds place, so the first number is GREATER!

Rounding

• Box your target number (what place value are you rounding)

• Underline your right neighbor

• If your neighbor is 5 or more, RAISE YOUR TARGET SCORE

• If your neighbor is 4 or less, LET YOUR TARGET REST (target stays the same)

• Everything in front of the target stays the same, everything behind the target turns to zeros

Key words for rounding

If a problem says words like "about", "estimate", "nearest", etc, it means that you will need to round the number. 

It doesn't want the exact number. 

Adding Numbers

• Follow STANDARD ALGORITHM

• Add the ones place first, then tens place, then hundreds place, and so on...

• Remember the carrying rule: IF YOU HAVE 10 OR MORE, GO NEXT DOOR!

Subtracting Numbers

• Follow STANDARD ALGORITHM

• Start subtracting from the ones place, then the tens, then hundreds, and so on..

• If you don't have enough in your top number, go next door and borrow

Adding or Subtracting Change

ALWAYS line up the decimal point when adding or subtracting money

Everything in front of the decimal is whole dollars. 
Everything behind the decimal is the change.

Cups and Ounces

There are 8 ounces in a cup. 
1 cup is = to 8 ounces

Another way to write ounces is "oz". (Example: 8 oz = 1 cup)

Capacity

• There are 4 quarts in a gallon

• There are 2 pints in each quart (so 8 pints in a gallon)

• There 2 cups in each pint (so 16 cups in a gallon)

• There are 8 oz in each cup (so 128 oz in a gallon)