Properties
Which property is shown in this addition sentence: 6+0=6
Identity (Zero) Property
Use mental math to find the sum.
37+16=
53
30 + 10=40
7+6= 13
30+13=53
Tyrell saved $73.
He spent $28 on a watch.
Use mental math to figure out how much money Tyrell has left.
45 Dollars
Round to the nearest ten to estimate.
31+66=
100
A gardener has 77 flowers. He plants 58 of the flowers.
Which is the best estimate of the number of flowers the gardener has left to plant?
20 flowers
Find the sum:
(8 + 6) + 7=
21
Lorna is playing a game.
She gets 13 points on her first turn.
She gets 17 points on her second turn.
Use mental math to find her score so far.
B. 30
The price of a CD player was $60.
It is now on sale for $22 less than the original price.
Which number sentence could you use to show how to find the sale price of the CD player?
A
Jed is in a flying disk contest.
His first throw goes 97 feet.
His next throw goes 128 feet.
Which number sentence shows the best way to estimate the total distance of both throws?
D. 230
On Saturday, 376 children and 132 adults visited the zoo.
Round to the nearest hundred to estimate the difference in the number of children and adults who went to the zoo that day.
300 children
Which property of addition is shown in the number sentence:
4+(1+5)= (4+1)+5
Use mental math to find the sum.
57 + 18 = ?
75
Use mental math to find the difference.
64−26=
38
The table shows how many books are in a class library.
Which is the most reasonable estimate of the total number of poetry and biography books?
Type of Book
Fiction 223
Poetry51
Biography146
Science53
C. 200
The lunchroom has 142 seats.
Children are sitting in 87 of the seats.
Which is the best estimate of the number of empty seats?
50 empty seats
Which property does this represent:
2+7=7+2
Commutative (Order) Property
Use breaking apart to add 36 + 24.
Which expression does NOT show a correct way to do this?
A.
Nora's soccer team needs $52 to buy enough pizzas for the team.
They have already collected $45.
Use mental math to figure out how much more money the team needs.
7 dollars
Round to the nearest hundred to estimate.
504+310=
800
At a party, 26 people ate in the house and 49 people ate in the yard.
Which number sentence shows the BEST way to estimate how many fewer people ate in the house than in the yard?
C. 50-25
Which number represents the question mark to make the number sentence true? 5 + (3 + ?)= (2+3) +5
2
The Martinez family drove 48 miles to visit a national park.
Then they drove another 32 miles to visit an amusement park.
Use mental math to figure out how many miles the Martinez family drove in all.
C. 80 Miles
Use mental math to find the difference.
81−29=
52
Kara has 72 stickers. Her sister has 148 stickers.
Use compatible numbers to estimate how many stickers Kara and her sister have altogether.
220 stickers
The school drama club has 422 tickets to sell for the play.
They have already sold 280 tickets.
Which is the best estimate of how many tickets are left?
100 Tickets