Question

3. Choose the correct option
8 x (6 x 7) is equal to:

a. 8 x 6 - 7

b. 8- (6 - 7)

e. 8 x 12

d. (8 x 6) x 7

ii. Which one of the following illustrates the Associative Law of addition?

a. 3+ (2 + 4) = (4 + 4) + 1

b. 3+ (2 + 4) = (3 + 2) + 4

c. 3+ (2 + 4) = (5 + 2) + 2

d. 3+ (2 + 4) = (2+6) + 1

iii. Which of the following illustrates the Associative Law of multiplication?

a. 4x (3 x 6) = (6 x 6 x 2

b. 4x (3 x 6) = (3 x 12) x 2

c. 4x (3 x 6) = (4 x 3) x 6

d. 4x (3 x 6) = (3x8) 3

4. Do this without using distributive property.

i) 39 x 63 + 39 x 37

ii) 81 x 450 +81 x 550

iii) 50 x 161 - 50 x 81

iv) 827 x 60 - 327 x 60


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Answer 1

Answer:

–––

It's pretty simple! No matter what order they are multiplied/added in, the solution will be the same.

3. i) d)

8 × ( 6 × 7 ) = ( 8 × 6 ) × 7

–––

3. ii) b)

3 + ( 2 + 4 ) = ( 3 + 2 ) + 4

–––

3. iii) c)

4 × ( 3 × 6 ) = ( 4 × 3 ) × 6

–––

In this type of question, just take the common number, in this case 39, outside the bracket.

4. i) 39 x 63 + 39 x 37

= 39( 1 × 63 + 1 × 37 )

= 39( 63 + 37 )

= 39( 100 )

= 3900

–––

ii) 81 x 450 +81 x 550

81( 450 + 550 )

= 81( 1000 )

= 81000

–––

iii) 50 x 161 - 50 x 81

50( 161 - 81 )

= 50( 80 )

= 4000

–––

iv) 827 x 60 - 327 x 60

60( 827 - 327 )

= 60( 500 )

= 30000

–––

Hope this helps :) [tex][/tex]

Answer 2

Answer:

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