Page 439 - Math Smart - 7

ANSWERS

Check My Understanding (Pg 15)
Unit 1
1. a)15 b)4 0)5 d)4 e)2
2. 8
Recall {Pg 4)
1.8) 15,30,45 b)20, 40, 60
Recall (Pg 16)
0)25,50,75 d)50, 100, 150
1. 0, 2, 4. 6 or 8; 2 2. 1,3, 5, 7, 9; 2
2. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Check My Understanding (Pg 21)
Check My Understanding (Pg 5)
1.2- A number is divisible by this number if the last
1. a) 1,3, 9 b) 1, 2, 4, 8, 16
digit is an even number
0)1,2,3, 4, 6,8,12, 16, 24, 48
3 - A number is divisible by this number If the sum of
d) 1. 3, 9, 11, 33, 99 e) 1,7, 49 f)1,13
its digits is a multiple of 3
2. a) 1 X 12, 2 X 6, 3 X 4 b) 1 x 7
4 - A number is divisible by this number if the number
0)1 X 16, 2 X 8,4 X 4 d) 1 x 21,3 x 7
formed by its last two digits is divisible by 4
e) 1 X 50, 2 X 25, 5 x 10
5 - A number is divisible by this number if its last digit
f) 1 X 48, 2 X 24, 3 X 16, 4 X 12, 6 X 8
is 0 or 5
3. a) Inoorreot: 4 b) Inoorreot: 2, 7 6 - A number is divisible by this number if It is
o) Inoorreot: 5 d) Inoorreot: 15 divisible by 2 and also by 3
4. a) false b) true o) false d)true 8 - A number is divisible by this number if the number
formed by its last three digits Is a multiple of 8
Check My Understanding (Pg 6)
9 - A number Is divisible by this number if the sum of
1. 7, 11. 19
its digits is a multiple of 9
2. Prime Number - A number that has exactly two factors:
10 - A number is divisible by this number if Its last digit
1 and itself
is 0
Factor - A number which divides into another number
100 - A number is divisible by this number if its last two
exactly without leaving a remainder
digits are 00
Product - The result obtained when two or more
2.
numbers are multiplied
3. 2 and 13 are prime, 8, 25 and 70 are composite. 357 3
432 2, 3. 4, 6, 8, 9
Check My Understanding (Pg 9) 2362 2, 6
1. a)1,3, 5, 15 b) Any multiple of 15.
5681 None
2. a) 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99
18 303 3
b) 1, 3, 9
58 475 5
0)9
d) i) false, 9 Is a multiple of 9 400 005 3, 5, 9
ii) false, 3 is not a multiple of 9 782 300 2, 4. 5, 10, 100
III) false, 3 Is a prime number 7 421 894 2
iv) false, 27 has other factors like 27 7 762 342 2
3. a) 9. 18, 27, 36, 45 b) 24, 30, 36, 42
4. a) true 3.2,3,4,6.8 4.2
b) false, 0 Is not a multiple of 6
o) false, 32 is not a multiple of 10 Recall (Pg 23)
5. 8 1. a) 1 b)4 0)9 d) 25
2. 36, 49, 64, 81, 100
Recall (Pg10)
1. 36 2. 48 3. 90
Check My Understanding (Pg 25)
1. 16, 25, 36,49, 64, 81. 100, 121, 144, 169, 196, 225,
Check My Understanding (Pg 11)
256, 289, 324, 361, 400
a) 35 b)30 o) 12 d) 14
2. a) Draw a 7 by 7 dot pattern
e)132 f) 180 g)150 h)72
b) Draw a 9 by 9 dot pattern
Check My Understanding (Pg 13)
Check My Understanding (Pg 26)
1. a) 1. 2, 3. 4, 6, 9, 12, 18, 36
1. Draw a 2-by-2 square grid, 3^ = 9, = 4, Draw a 5 by 5
b) 1, 2, 3, 4, 6, 8, 9 ,12, 18, 24, 36, 72
square grid. Draw a 6 by 6 square grid, V36 = 6, 7^ = 49
0) 1, 2, 4, 5, 8, 10, 16, 20, 80
Draw a 7 by 7 square grid
2. a) 23 X 32 X 52 b) 22 X 3 X 52
2. 8)10 b)9 0)12 d)20
e)19 f)21 g)26 h)14 4.
Check My Understanding (Pg 14)
3. Top to Bottom;
1. a) 30 b)48 o)60 d)672 e)80
- sixteen, = ten, = fifty, - fourty, = eleven, = one, = zero
2. 120
Left to Right:
- two, - twenty, - fifteen, - thirty, = nine, - eighty
4. a) true