12. Try these. Remember, the first part of your answer will be in the tens column, so you will be estimating by multiplying by a 10 (there could be remainders).


a) 518 ÷ 14 d) 812 ÷ 28


g) hrs mins 2 1


27 36


+ 3 24


k) hrs mins 4


23 – 1 49


b) 342 ÷ 18 e) 630 ÷ 35


h) hrs mins 4 2


39 43


+ 1 16


l) hrs 8


mins 14


– 4 56


i) hrs 3 5


mins 54 26


+ 3 09


m) hrs mins 6


32 – 2 45


c) 495 ÷ 24 f) 875 ÷ 39


j) hrs 1 6


mins 35 29


+ 2 18


n) hrs mins 7


05 – 5 18


13. See if you can write these times in the 24-hour system. (Remember to use 4 digits.) a) 4:34pm e) 7:28pm


b) 8:51am f) 12:37pm


b) 10:17 f) 03:56


c) 10:19pm g) 1:38am


c) 23:12 g) 21:42


d) 11:47am h) 8:06pm


14. Now try it the opposite way. Remember to identify the times as am or pm. a) 17:05 e) 17:39


d) 12:15 h) 00:45


15. Find equivalent fractions for the following fractions by multiplying by a member of the family of 1.


a) 1


– 4


b) 1


– 8


c) 2


– 3


d) 3


– 5


e) 7 __


10 f) 5


– 6


g) 3


– 7


h) 5


– 9


16. Now find equivalent fractions for the following fractions by dividing by a member of the family of 1.


a) 21 __


24


b) 18 __


27


c) 14 __


18


d) 24 __


30


e) 49 __


63 f) 32


__ 56


g) 35 __


45


17. Now try these. Remember to change the fractions so that they have the same denominator. Estimate the answers first.


a) 1


– 2 + 1


– 3


b) 1


– 4 + 3


– 8


c) 2


– 3 + 1


– 5


d) 1


– 8 + 5


– 6


e) 3


– 4 + 2


– 3


f)


__ 12 + 3


5


– 8


18. See if you can work these out. Remember to find the lowest common multiple (LCM) of the denominators so that you can make equivalent fractions with the same denominator.


a) 9 __


4 10 – 3


– 4


b) 5 Look Back


– 6 – 2


– 9


c) 7


– 8 – 5


– 6


d) 8


– 9 – 1


– 6


e) 4


– 5 – 3


– 4


f) 6


– 7 – 2


– 3


h) 25 __


50


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