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Welcome to Unit One – Place Value with addition and subtraction

Less than < Greater than>

< >

Vocabulary

• Greater than (>) – a symbol used to show numbers greater than another

• Less than (<) – a symbol used to show numbers less than another

• Equals (=) a symbol used to show numbers having the same value

HOW TO COMPARE USING >, < AND =

Example 1: Compare 76 and 67

Write: Say:

67 < 76 67 is less than 76

76 > 67 76 is greater than 67

Remember, the mouth of the symbol (> or <) always opens to the greater number.

How to compare numbers

Line up thenumbers

Compare athighest

place value

If numbersare the same

go to next digitto the right

12,391 8,97113,762

12,391 8,97113,762

12,391 8,97113,762

1 2 3

Algorithm A set of steps used to solve a mathematics

computation.

Digits The symbols we use

to represent numbers (0,1,2,3,3,4,5,6,7,8,

and 9).

Expanded Form A way to write a

number by showing the value of each individual digit

forming the number.

Place The position of a

digit in a number.

Place Value The magnitude

assigned to particular position in a numeral,

such as units, tens, hundreds, etc. in the

decimal system.

Standard Form A way to write

a number using digits.

RoundingFinding an approximate number that has fewer non-zero digits, so

that it will be easier for further estimation calculations. Usually,

numbers are rounded to the nearest ones, tens, hundreds,

etc.

The Rounding Rap

Find the place value and underline the digit,

Move to the right and circle it, get it?

Zero through four – stays the same,

Five through nine – Add one is the game.

Now flex your muscles like a hero.

Digits to the right change to zero.

All other digits stay the same.

Yo!! You’re a winner in the rounding game!

Remember in rounding the high 5 is KEY!

Rounding to the nearest 10

26 rounded to the nearest 10

Think it through:

26 is between 20 and 30 on a number line

25 is halfway

I must round to the higher number 30

 

Rounding to the nearest 100

347 rounded to the nearest 100

Think it through:

347 is between which two hundreds 300 and 400

350 would be halfway

347 is less than halfway round down to 300

 

Rounding to any place

Ex. 67,589 rounded to the nearest thousand

Think it through with steps…

Find the place value to round to

That is the 7 underline it

Now go to the right if the number is 5 or higher and one to the underlined place change everything else to zero 68,000.

CHECK – by saying 67, 589 is between 67,000 and 68,000

 

 

 If the number to the right is 4 or lower keep the underlined number the same and change the other numbers to the right to zeros.

Ex. 67,389 rounded to the nearest thousand

3 is four or less so keep the 7 and change the rest of the numbers to the right to zeros. 67,000.

CHECK – by saying 67, 389 is between 67,000 and 68,000

Addition Words:• Sum *Total *Plus • Altogether *and• Increased by• Together *combined

Subtraction Wordsdifference left over

less thanExceed minus are nottake away remainfewer how many more