Day Three Try these. 1


There are 85 houses in Shona’s estate. Use the following clues to work out the number of her house:


ƒ It is not a multiple of 5. ƒ It is not a square number. ƒ It has double digits. ƒ It is a prime number.


ƒ The units digit is larger than the tens digit.


ƒ The number is a factor of 158.


ƒ When you add the two digits together, you get a square number.


2


Jake lives in the same estate as Shona. Use the following clues to work out the number of his house:


ƒ The number is between 10 and 45. ƒ It is an odd number. ƒ It is a composite number.


ƒ The tens digit is smaller than the units digit.


ƒ It is a multiple of 7. 3 Answer:


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85


Answer: Marks: /2


10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45


Marks: /2


At the ice-cream van, Shona paid for an ice-cream cone and 2 packets of crisps with an equal number of 5c, 10c and 20c coins. If the treats cost €3.15, with how many of each type of coin did she pay?


Answer: 4


Marks:


Jake spent the same amount of money as Shona at the ice-cream van. He paid with a €5 note and his change was made up of coins no bigger than 50c, but no smaller than 5c. What is (a) the fewest number and (b) largest number of coins that he could have received in change?


/2


Answer: (a) 106


(b)


Marks: Today’s Marks:


/2 /8


Week 25 | Strategy: Working Systematically


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