Multiplication Magic #1

Multiplication Magic #1

We are learning to use place value to solve multiplication problems using whole numbers.

A factor is the multiple’s that equal 24 or 30

Factors of 24: 24,1,6,4,2,12,8,3,

Factors of 30: 10,3,30,1,6,5,

A Multiple is any multiple of that number

Multiples of 6:     ,60,66,72,12,18,24,30,42,48,54,

42 = 16, 4 x 4=16

√49 =7, 7 x 7=49

25 x 8 = 200

20 x 8= 160

5 x 8 =40

160+40=200

25 x 15 = 375

20 x 15 =300

5 x 15 =75

  

  Show your working under each problem:

1.  Mrs Ilaoa orders 5 boxes of bats. If each box contains 7 bats, how many
bats are there altogether?

5x 7=15

2. She then orders 23 boxes of cones. If each box contains 8 cones,
how many cones are there altogether? 

23 x 8=

20x 8=160, 3 x 8= 24 

160+24=184

3.Mrs Tele’a orders pencils for team 5. She orders 25 boxes of 12 pencils.
How many pencils are there altogether?

25 x 12=

20x10=200, 2 x 2=4

5x10=50, 5 x 2=10

200+4=204, 50+10=60

204+60=264

4. Chance has brought some lollies in to share with the class for her birthday.
She has brought 14 packets which contain 12 lollies each. How many lollies are there altogether?

14 x 12=

10x10=100, 10 x 2=20

 4 x 10=40. 4 x 2=8

100+20=120, 40+8=48

120+48=168

5. Team 5 are working out how much money they can make from their fundraising
at the garage sale.

If they sell 27 plates of food for $12 each, how much money will they make?

27 x 12=

20x10=200, 20 x 2=40

7 x 10=70, 7 x 2=14

200+40=240, 70+14=84

240+84=324

If they sell 45 cakes for $15 each, how much money will they make?

45x 15=

40 x 10=400, 40x 5=200

5x10=50, 5 x 5=25

200+400=600, 50+25=75

600+75=675

6. Room 4 is 12m long and 11m wide. What is the area of the room?

12 x 11=

10x10=100

10x1=10

2x10=20

2x1=2

100+10=110

20+2=22

110+22=132