Properties, Mental Math, Rounding

Properties

100

Any number plus 0 always equals________

The original number

200

True or False: 

35+(72+83)= 72+(35+83)

True

300

Why does 15+25=25+15?

It doesn't matter the order, commutative property

400

Which property: 

63+0=63

Identity

500

Which properties: 

64+(14+0)=14+(0+64)

Identity and associative

Rounding

100

Round to nearest 10: 

637

640

200

Round to nearest 100: 

647

600

300

Round to nearest 10 and 100: 

532

530 and 500

400

Round to nearest 10 and 100: 

802

800 and 800

500

Daily Double: 

Round to nearest 10, 100, and 1,000-

1,432

1,430, 1,400, and 1,000

Adding

100

Using mental math-explain how to solve:

287+112

200 + 100= 300

80+10=90

2+7=9

392

200

Using mental math, explain how to solve: 

481+216

400+200=600

80+10=90

1+6=7

697

300

True or False: If false, explain why.

415+402=

400+400=800

10+100=110

5+2=7

917

False: 

Tens place is 10 + 0=10

400

True or False: If false, explain why.

563+422=

500+4000=900

60+20=80

3+2=5

985

True

500

True or False: If false, explain why.

712+181=993

False:

700+100=800

10+80=90

2+1=3

893

Subtracting

100

Using mental math explain how to solve: 

432-120=

400-100=300

30-20=10

2-0=2

312

200

Using mental math, explain how to solve:

218-107=

200-100=100

10-0=10

8-7=1

111

300

True or false, if false explain why: 

411-732=321

False:

732-411=321

Big number needs to go first

400

Solve using mental math:

583-261=

500-200=300

80-60=20

3-1=2

322

500

True or False: If false explain why. 

975-851=

900-800=100

70-50=20

5-1=4

100-20-4=76

False: add the places together not subtract.

124

Surprise

100

What hand is the big hand on at 10:30?

6

200

What time is lunch?

11:30

300

What hand is the little hand on at 8:15?

8

400

How many sides does a quadrilateral have?

4

500

Daily Double: 

If I have a bag of 16 blue erasers and 4 purple erasers, what color am I more likely to pull out of the bag?

blue