Adding and Subtracting
A photographer took 129,332 pictures at a wedding. The guests bought 98,632 pictures.
How many pictures did the photographer have left?
D. 30,700 pictures
There are 450 people going to the concert. There are 18 rows of chairs.
How many chairs are in each row?
C. 25 chairs
12 x 9
108
List the steps to a division problem
Divide, multiply, subtract, bring down
Sally has 16,452 raffle tickets for her party. Each guest receives 36 tickets.
How many guests are at the party?
Division
Fritz found 763 insects in his backyard. He found 1,278 insects at the park. He found 9,623 insects at the lake.
How many insects did Fritz find in all?
C. 11,664 insects
There are 3,560 rows of flowers growing in the field. There are 299 flowers in each row.
How many flowers are growing in the field?
A. 1,064,440 flowers
When you multiply, will your answer be bigger or smaller?
Bigger
What property of multiplication is this?
5 x 7 = 7 x 5
Commutative property
Janet works at a shoe store. She sold 2,457 sneakers on Sunday, 6,532 sneakers on Monday, and 5,239 sneakers on Tuesday.
How many sneakers did she sell in all?
Addition
A pet store has 4 large tanks full of fish. The first tank has 64 fish. The second tank has 43 fish. The third tank has 91 fish and the largest tank has 111 fish. How many fish does the pet store have altogether?
A. 309 fish
A telephone operator answers 7,543 calls a month.
How many calls does the telephone operator answer in ten months?
A. 75,430 calls
What is reasonableness?
Your answer makes sense in the context of the problem
What property of multiplication is this?
0 x 43 = 0
Zero property
A photographer took 129,332 pictures at a wedding. The guests bought 98,632 pictures.
How many pictures did the photographer have left?
Subtraction
Mr. Gibson had 17,003 toys to give away. He gave 789 toys to the local children's hospital.
How many toys does Mr. Gibson have left?
D. 16,214 toys
There are 982 bars of chocolate. One box will hold 64 bars of chocolate.
How many boxes will be completely filled?
How many bars of chocolate will be left over?
A. 15 filled boxes with 22 bars of chocolate left over
What is the next step in this problem?
56
x 24
224
Add the imaginary zero
What property of multiplication is this?
1 x 57 = 57
Identity property
Each bag of jelly beans that Sharri bought contained 5,367 beans. She bought 19 bags.
How many jelly beans did Sharri buy?
Multiplication
The town newspaper printed 999,998 special edition newspapers. They sold 878,898 of the newspapers.
How many of the special edition newspapers do they have left?
C. 121,100 newspapers
Each class at Alberta Elementary School collected 987 bottles. There are 37 classes at the school.
How many pennies were collected by the school?
B. 36,519 bottles
What is the next step:
(Teacher model)
Bring down
(4 x 5) x 6 = 4 x (5 x 6)
Associative property
There are 45,056 people going to the sold out football game. There are 54 chairs in each row.
How many rows are in the stadium?
Division