6th grade testing

What is the result of

-10 - 10 = ?

• 20

• 15

• -20

• 0

Find the Lowest Common Multiple of 3 and 12 ?

• 3: 3, 6, 9, 12, 18, ...

  12: 12, 24, 36, 48,...

  -> LCM 12

• 3: 1, 3, 6, 12,...

  12: 1, 12, 24, 36, 48,...

  -> LCM 1

• 3: 12, 18, ...

  12: 36, 48,...

  -> LCM 0

• 3: 3, 6, 9, ...

  12: 12, 48,...

  -> LCM 3

Find the factor of this number and is it prime number?

98

• 98= 2 x 7 x 3

  It is prime number

• 98= 2 x 7 x 7

  It is prime number

• 98= 1 x 4 x 5

  It is prime number

• 98= 2 x 7 x 7

  It is not prime number

Find the Lowest Common Multiple of 4 and 10 ?

• 4: 4, 8, 12, 16, 20, ...

  10: 10, 20, 30, 40,...

  -> LCM 20

• 4: 1, 4, 8, 12,...

  10: 1, 10, 20, 30, 40,...

  -> LCM 4

• 4: 10, 20, ...

  10: 30, 40,...

  -> LCM 0

• 4: 4, 8, 12, ...

  10: 10, 40,...

  -> LCM 4

What is the result of -15 + 5 ?

• -10

• -20

• 10

• -5

Find the Lowest Common Multiple of 6 and 9 ?

• 6: 6, 12, 18, 24, 30, ...

  9: 9, 18, 27, 36,...

  -> LCM 18

• 6: 1, 6, 12, 18,...

  9: 1, 9, 18, 27, 36,...

  -> LCM 6

• 6: 9, 18, ...

  9: 27, 36,...

  -> LCM 0

• 6: 6, 12, 18, ...

  9: 9, 36,...

  -> LCM 18

Find the Greatest Common Factor ( GCF) of 42 and 21

What is the result of 1/4 + 4/8 = ?

• 8/8

• 6/8

• 3/4

• 4/3

A chef made 30 donuts in 60 minutes. How long would it take him to make 90 donuts?

The total weight of 15 boxes is 45 pounds. How much would 40 boxes weigh?