Download Subtracting Ones, Tens, Hundreds, and Thousands

Trimester 1- Math
Numbers to 10, 000
Rounding Numbers
Estimation
Addition and Subtraction
Multiplication and Division
Please use the tips in this section to
help you to study for the TA and to
complete your homework.
Unit 1: Numbers to 10,000
Adding Ones, Tens, Hundreds and Thousands
To find the sum of two 4-digit numbers,
Step 1: Add the ones
Step 2: Add the tens
Step 3: Add the hundreds
Step 4: Add the thousands
Change 10 ones for 1 ten, 10 tens for 1 hundred, 10 hundreds for 1 thousand when we have
more than 10 ones, 10 tens, or 10 hundreds to add.
Subtracting Ones, Tens, Hundreds, and Thousands
To find the difference between two 4-digit numbers:
Step 1: Subtract the ones
Step 2: Subtract the tens
Step 3: Subtract the hundreds
Step 4 Subtract the thousands.
Change 1 ten for 10 ones, 1 hundred for 10 tens, 1 thousand for 10 hundreds when we do not
have enough ones, tens, or hundreds to subtract from
Multiplying and Dividing by 6,7,8, and 9
Fact Fluency will help you to multiply and divide easily 
Multiply Ones, Tens, Hundreds, and Thousands
To find the product of two digit numbers, we multiply them:
To multiply a 2-digit number by a 1-digit number
Step 1: Multiply the ones by the 1-digit number
Step 2: Multiply the tens by the 1-digit number
To multiply a 4-digit number by a 1 digit number:
Step 1: Multiply the ones by the 1-digit number.
Step 2: Multiply the tens by the 1-digit number
Step 3: Multiply the hundreds by the 1-digit number.
Step 4: Multiply the thousands by the 1-digit number.
Check your answers by estimating.
Dividing with a Quotient and Remainder
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When you divide, the answer is called a quotient.
When a number cannot be divided by another number exactly, there is a remainder.
Numbers in which the ones digit is 0,2,4,6, or 8 are even numbers. All even numbers can divided by 2
exactly.
Numbers in which the ones digit is 1, 3, 5, 7 or 9 are odd numbers. All odd numbers cannot be divided
by 2 exactly. There is a remainder of 1.
To divide a 3 digit number by a 1-digit number:
Step 1: Divide the hundreds by the 1-digit number.
Step 2: Divide the tens by the 1-digit number.
Step 3: Divide the ones by the 1-digit number.
Using Number Patterns
Try these on your own!