MEAP Review: Multi Digit Multiplication and Division of Whole Numbers and Decimals

• ANSWERS

Dividing Difficult Large Numbers

31) 1719• 31 will not go into 1• 31 will not go into 17• 31 will go into 171

Dividing Difficult Large Numbers

31) 1719To figure what yourfirst number will becover the 1 in 31 &the 1 in 171.

Dividing Difficult Large Numbers

31) 1719Now ask how many3’s will go into 17.

Dividing Difficult Large Numbers

31) 1719Be sure to put thatnumber directly abovethe 1 not the 7.

5

Dividing Difficult Large Numbers

31) 1719Now multiply the 5x 31 and place it under the 171.

5

Dividing Difficult Large Numbers

31) 171931x5

5

155

155169

Dividing Difficult Large Numbers

31) 17195

155169

Now coverup the 1 in 31& the 9 in 169

Dividing Difficult Large Numbers

31) 17195

155169

Ask how many 3’s willgo into 16.

Dividing Difficult Large Numbers

31) 17195

155169

Place thatnumber nextto the 5 in your quotient.

5

Dividing Difficult Large Numbers

31) 17195

155169

Now multiply31 x 5.

5

Dividing Difficult Large Numbers

31) 17195

155169

5

15514

Subtract &your answeris 55 R14

Dividing Difficult Large Numbers

31) 17195

1551699

31X 5

5

155

155

Check It Using the Inverse of Division:

31 Multiply the divisor by the quotient. X 55 155+1550 1705+ 14 Add Remainder to the product1719 Your answer should math the original dividend

Multiplying and Dividing by powers of ten

MEAP REVIEW

10

100

1000

10100

5 7 4 8 23

ths101 ths

1001

ths1000

1s'1s'101001000000,10

What are the PLACE

VALUES of the digits in this number?

5 7 4 8 23

ths101 ths

1001

ths1000

1s'1s'101001000000,10

So that means

500 + 30 + 7 + + +104

1008

10002

5 7 4 8 23

ths101 ths

1001

ths1000

1s'1s'101001000000,10

The decimal point just separates the whole

numbers from the decimal fractions

5 7 4 8 23

ths101 ths

1001

ths1000

1s'1s'101001000000,10

What happens when I multiply this number by

10 ?

5 7 4 8 23

ths101 ths

1001

ths1000

1s'1s'101001000000,10

Each digits value will become 10 times bigger so the digits move LEFT into

the next column

537.482 x 10 = 5374.82

Multiplying by 10

It LOOKS like the decimal point moves one place to the right. (and that is how many teachers ask you to

think of it)

Multiplying by 10

Moving the digits one place to the LEFT looks the same as moving the decimal point one

place to the RIGHT.

5 7 4 8 23

5 7 4 8 23

More Multiplying and Dividing

Digits Move ( LOOKS LIKE )Decimal Point Moves

x10 One place to LEFT One place to RIGHT

x100 Two places to LEFT Two places to RIGHT

÷ 10 One place to RIGHT One place to LEFT

÷ 100 Two places to RIGHT Two places to LEFT

Thanks for watching.

I hope I haven’t LEFT you confused but I

thought we should get this RIGHT

To practice multiplying and dividing by multiples of ten, click on this website: http://www.bbc.co.uk/skillswise/numbers/wholenumbers/multiplication/multiply10and100/quiz.shtml

Get ready to boost these BAMZOOKI Zooks against the clock. Game on!Bamzooki Multiplying and Dividing

Quiz following the Investigation

Then….

• You’ll need all your mental maths skills to escape with the bio-rods in this exciting Mission 2110 game.

• Alien Game• Homework TIME• Multiplication and

Division Practice Handout