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Math ReviewUnit 2

Miss Bowen4th Grade Math

37+0=37

True or False?

37+0=37

True- The identity property tells us that any # plus

zero= that #

99-0=98

True or False?

99-0=98

False- Any # minus zero =that #, no more and

NO LESS

17+13=13+17

True or False?

17+13=13+17

True- The Commutative property tells us that

the order in which numbers are added does not change the sum.

97+27=17+97

True or False?

97+27=17+97

False- The same numbers were not added on

both sided of the equation.

(15+5)+10=(10+5)+15

True or False?

(15+5)+10=(10+5)+15

True- The associative property tells us that the

way in which numbers are grouped when added does not change the sum.

37+ _____= 19+37

Fill in the missing number.

37+ _____= 19+37

37+19=19+37

We must add the same numbers on both sides of the equation. We had 37 on both sides, but only 19 on the right. We must also add 19 to the left.

100 more than 6,785

100 more than 6,785=

6,785+100=6,885

“More than” tells us that we need to use addition.

1,000 less than 14,998

1,000 less than 14,998

14,998-1,000=13,998

“Less than” tells us that we need to use subtraction.

10 less than 596

10 less than 596

596-10=586

“Less than” tells us that we need to use subtraction.

6,788; 7,788; _______; 9,788

Fill in the missing number.

6,788; 7,788; _______; 9,788

1,000 more; 8,788

999; 1,000; 1,001; _______; 1,003

Fill in the missing number.

999; 1,000; 1,001; _______; 1,003

1 more; 1,002

23,486; 23,476; _________; 23, 456

Fill in the missing number.

23,486; 23,476; _________; 23, 456

10 less; 23, 466

2,838+200=

Solve the equation

2,838+200=

3,038

303+98=

Solve the equation

303+98=

401

1,620+804=

Solve the equation

1,620+804=

2,424

37+16=

Solve the equation

37+16=

53

5,330+999=

Solve the equation

5,330+999=

6,329

6,561-272=

Solve the equation

6,561-272=

6,289

3,811-428=

Solve the equation

3,811-428=

3,383

7,785-1,494=

Solve the equation

7,785-1,494=

6,291

77,000-31,470=

Solve the equation

77,000-31,470=

45,530

660,000-83,259=

Solve the equation

660,000-83,259=

576,741

There are 12,465 fans attending the local football game this week. Last week, 16,038 fans came out for the game. How many more fans attended last week’s game than this week’s game?

Word Problems

Understand12,465 fans this week16,038 fans last week

Plan How many more= subtraction (-)16, 038-12,465=

Solve 16, 038-12,465= 3573

Check Does 3,573+12,465=16,038?

Yes- our answer is correct.

There are 12,465 fans attending the local football game this week. Last week, 16,038 fans came out for the game. How many more fans attended last week’s game than this week’s game?

Riley ran 1,025 meters at the track meet. Elizabeth ran 1,280 meters. How many more meters did Elizabeth run than Riley?

Word Problems

UnderstandRiley- 1,025 mElizabeth- 1,280 m

Plan How many more= subtraction (-)1,280-1,025=

Solve 1,280-1,025= 255

Check Does 1,025+255=1,280?

Yes- our answer is correct.

Riley ran 1,025 meters at the track meet. Elizabeth ran 1,280 meters. How many more meters did Elizabeth run than Riley?

Betty’s Bakery sells 2,012 muffins each week. They also sell 5,025 cookies and 416 cakes each week. What is the total number of baked goods sold at the bakery each week?

Word Problems

Understand2,102 muffins5,025 cookies416 cakes

Plan Total number= addition (+)2,102+5,025+416=?

Solve 2,102+5,025+416=7,543

Check Does 7,543-2,102-5,025-416=0?

Yes- our answer is correct. Betty’s Bakery sells 2,012 muffins each week. They also sell 5,025 cookies and 416 cakes each week. What is the total number of baked good sold at the bakery each week?

Madelyn and her mother baked 48 cookies. She took 24 cookies to school and her brother ate some too. They now have 18 cookies. How many cookies did Madelyn’s brother eat?

Word Problems

Understand

48 cookies bakedTook 24 to school

Now 18 How many did her brother take?

Plan Took= subtraction (-)Brother takes= subtraction48-24-18=________

Solve 48-24=2424-18=6Her brother took 6 cookies.

Check Does 18+6+24= the original # of cookies (48)?Yes- our answer is correct.

Madelyn and her mother baked 48 cookies. She took 24 cookies to school and her brother ate some too. They now have 18 cookies. How many cookies did Madelyn’s brother eat?

Hannah’s choir group is selling coupon books for charity. Hannah sold 23 books and her friend Meghan sold 31. They have 6 books left to sell. How many total books did the two girls have to sell?

Word Problems

Understand

Hannah sold 23Meghan sold 316 left

Plan Total number= addition (+)23+31+6=___________

Solve 23+31=5454+6=6060 is the total number of books that the girls must sell.

Check Does 60-6-31-23=0?

Yes- our answer is correct.

Hannah’s choir group is selling coupon books for charity. Hannah sold 23 books and her friend Meghan sold 31. They have 6 books left to sell. How many total books did the two girls have to sell?

Estimate the sum or difference by rounding each number to the nearest tens.

Keith owns 8,749 books and Mike owns 5,756 books. About how many books do they have together?

Word Problems

UnderstandMike 5,756 BooksKeith 8,749 Books

Plan Together= addition (+)Rounding to the nearest tens

Solve 5,756 5,7608,749 8,7505,760+8,750= 14,510

Check Is the true answer within 10?5,756+8,749=14,505Yes, our answer is correct.

Estimate the sum or difference by rounding each number to the nearest tens. Keith owns 8,749 books and Mike owns 5,756 books. About how many books do they have together?

Estimate the sum or difference by rounding each number to the nearest hundreds.

Mike decided to drive across America. He drove 8,618 miles the first week, and 3,272 miles the second week. About how many miles did Mike drive in total?

Word Problems

Understand8,618 Miles (Week 1)3, 272 Miles (Week 2)

Plan In total= addition (+)Rounding to the nearest hundreds

Solve 8,6188,6003,272 3,3008,600+3,300= 11,900

Check Is the true answer within 100?8,618+3,272=11,890

Yes- our answer is correct.

Estimate the sum or difference by rounding each number to the nearest hundreds. Mike decided to drive across America. He drove 8,618 miles the first week, and 3,272 miles the second week. About how many miles did Mike drive in total?