Rules of Addition
Subtraction Rules
Patterns
Rounding
Adding whole numbers
100

150+300- k =250


What does the 'k' represent in this equation

The variable
100

What is the unknown

37-?=37

0

100

10 less then 221

211

100

Round 59 to the nearest 10

60

100

9824+349

10,173

200

150+300-22= ?

What does the question mark symbolize in this equation

The unknown

200

What is the unknown

25-?=0

25

200

10 more then 45,301

45,311

200

Round 684 to the nearest hundred

700

200

650+250=

800

300

What rule of addition is

(5+2)+3=5+ (2+3)

Associative Property of Addition

300

When you substract 0 from any number, the result is always _____

the number

300

8,901/8,911/8,921 

What is the next number in the pattern

8,931

300

58,713 Rounds to what number?

60,000

300

Solve 738+56 by rounding

740+54=794

400

What rule of addition is 

4+1=1+4

Commutative Property of Addition

400

What is the subtraction rule for

22-0=22

When you subtract 0 from any number, the result is the number


400

10,000 less then 12,846

2,846

400

What is the difference?

15,000-8,000

7,000

400

Add:8346+7208

Then check by estimating

15,544

Estimating: 8,000+7,000=15,000

500

What rule of addition is 

8+0=0

Identify Property of Addition

500

What is the subtraction rule for 

16-16=0

When you subtract any number from itself the result is 0

500

What is the pattern?

959,987/969,987/979,987

10,000 more

500
Use mental math to subtract:


7,930-4,623

3,307

500

Add: 743,980+211,315

Then check by estimating

955,295

Estimate: 740,000+211,000=951,000

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