Math

For some of these I think I have the right answer but I need a second opinion, Thanks :)

(1). 223.7 km=_m.
A} 223,700 ***(I multiplied by 100)
B} 22,370
C} 22.370
D} 0.2237

(2).Write the metric unit that makes the statement true.
3.219m=3,219___
^cm****(Not sure)
^dm
^km
^mm

(3). Use benchmarks to estimate the sum,difference, or product
14/16+1/5
^2
^0
^1/2***
^1

(4). 5 2/11- 3 2/18
^3***
^1
^4
^2
(5). Use benchmarks to estimate the sum, difference, or product.
7 2/7 x 3 7/9
^32
^28****( not completely sure)
^24
^21
(6). Find the sum.
2/9+4/9
^1
^2/3
^6/81
^1/3****(Not completely sure)
(7). -6/7+6/21
^-4/7***
^12/49
^-1 3/7
^12

  1. 👍 0
  2. 👎 0
  3. 👁 147
  1. (8). 12 1/9+ 10 2/3
    ^22 1/6****
    ^22 7/9
    ^22 1/9
    ^22 1/4
    (9). -1/5+(-3/7)
    ^-22/35
    ^-1/3
    ^12/35
    ^4/7
    (10). 4/9-1/3
    ^1/27
    ^1/9
    ^1
    ^5/27****
    (11). -3 5/9-1 3/9
    ^-4 2/9
    ^-4 8/9
    ^2 1/9
    ^2 2/9

    (12). 5 2/3-4 5/9
    ^1 1/9****
    ^8/9
    ^1 1/2
    ^3/4

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  2. 1. no - 1 km = 1000 m
    2. yes
    3. no
    4. no
    5. yes
    6. no
    7. yes

  3. ok thanks ms.sue, what about the second set?

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  4. 8. no
    9. ?
    10. no
    11. ?
    12. yes

  5. Okay thanks for the help :)

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    2. 👎 0
  6. You're welcome.

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