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Problem Solvers
MATH RULES
100

What is 100 more than 345,621?

345,721

100

23,456 + 12,300 = ?

35,756

100

Round 4,209 to the nearest hundred.

4,200

100

Maria has 2,450 stickers. She gives 500 to her friend. How many does she have left?

1,950 left

100

Which property is shown?

5 + 8 = 8 + 5


Commutative Property

200

What is 1,000 less than 72,450?

71,450

200

45,000 + ___ = 78,250

33,250


200

Round 67,845 to the nearest thousand.

68,000

200

A library has 1,235 fiction books and 2,675 nonfiction books. How many books are there altogether?

3,910 books

200

Which property is shown?

(3 + 6) + 4 = 3 + (6 + 4)

Associative Property

300

What number is 100 more than 498,765?

498,865


300

126,435 + 52,678 = ?

179,113


300

Round each number to the nearest thousand and add:124,567 + 35,432

160,000

300

A toy costs $18,750. Carlos has $12,500. How much more money does he need?

$6,250

300

True or False:

The Commutative Property works for subtraction.

False

400

What number is 1,000 less than 100,000?

99,000

400

A store sold 45,678 pencils in January and 56,789 in February. How many pencils did it sell altogether?

102,467

400

A school has 108,765 students in one district and 165,432 in another. Estimate the total by rounding to the nearest ten thousand.

280,000

400

A bakery made 25,600 cookies. It sold 12,450 in the morning and 8,675 in the afternoon. How many cookies were left?

4,475 left

400

Give an example showing that subtraction is not commutative.

9 − 4 ≠ 4 − 9

500

I am thinking of a number. 1,000 less than my number is 56,789. What is my number?

57,789

500

A school collected 125,675 cans during one campaign and 87,459 during another. How many cans did they collect altogether?

213,134

500

Estimate by rounding to the nearest thousand:

287,654 + 143,789


432,000

500

A school has 35,000 notebooks. It gives 12,450 to Grade 4 and 9,875 to Grade 5. How many notebooks are left?

12,675 notebooks left

500

Explain in your own words what the Associative Property of Addition does.

It allows us to change the grouping of numbers when adding without changing the answer.