Topic 10: Multiply by Multiples of 10

multiples of 10

100

7x20=?

140

200

20x8=?

160

300

6x60=?

360

400

7x30=?

210

500

90x5=?

450

multiples of 100

100

200x6=?

1,200

200

600x4=?

2,400

300

400x4=?

1,600

400

500x3=?

1,500

500

800x6=?

4,800

multiplication properties

100

What property does this example prove?

20x2=2x20

40 = 40

Commutative

200

What property does this example prove?

(2x10)x2= (2x2)x10

(20)x2=(4)x10

40 = 40

Associative

300

What property do these examples prove?

20x0=0

21x0=0

22x0=0

zero property

400

Solve using commutative property: Fill in the blank

10x2x5=

___x 5

20

500

Solve using Associative Property: Fill in blank

   40x6= 

(__x10) x 6=

240

Addition properties

100

What property does this example prove?

20+2=2+20

22 = 22

Commutative 

200

What property does this example prove?

(10+10)+2= (2+10)+10

(20) +2 =  (12)+10

22 = 22

Associative 

300

Solve using Associative Property: Fill in blank

   60+2= 

(__+30)+2 = (2+30) +__

62

(30+30)+2 = (2+30) +30

400

Solve using Associative Property: Fill in blank

   70+6= 

(__+__)+___ = 

(____) +__=

276

500

Solve using Commutative Property: Fill in blank

   120+4= 

(__+__)+___ = 

(____) +__=

124

Solve for the unknown using an open number line

100

200x4=?

800

200

50x5=?

250

300

300x6=?

1,800

400

7x30=?

210

500

300x2=?

600