Brain teasers www teachitprimary co uk 2014 15504

Brain teasers! © www. teachitprimary. co. uk 2014 15504 1

Today’s answer is… 64 How many different calculations and word problems can you create to lead you to this number? Try using one or more of these symbols in your Want a challenge? calculation: %, ° or n Next © www. teachitprimary. co. uk 2014 15504 2

Number of children in KS 2 How many questions can you ask about this graph? © www. teachitprimary. co. uk 2014 15504 Next 3

2 km How many different units can you convert this amount into? 10 mm = 1 cm 100 cm Facts= 1 m 1000 m = 1 km © www. teachitprimary. co. uk 2014 cm into feet: divide by 30 mm into inches: divide by 25 m into yards: divide by 10, multiply by 9 km into miles: divide by 3, multiply by 2 Want a challenge? 15504 Next 4

Value added tax is 17. 5% Work out the value added tax on these items. £ 2. 80 £ 3. 60 £ 7. 20 £ 36. 00 10 %: Need divide aby 10 10 ÷ 2 = 5 helping 5 ÷ 2 =hand? 2. 5 © www. teachitprimary. co. uk 2014 15504 Next 5

Shape problems Work out the length of each side of the shape. What is the total area of the shape? What is the perimeter of the shape? 12 x 4 9 x 9 © www. teachitprimary. co. uk 2014 Area = length x width Need a helping Perimeter is the total distance around hand? the outside edge. Next 15504 6

Make the sequence Rule: x 2 + 1. 5 Write down the first 10 numbers of the sequence. Next © www. teachitprimary. co. uk 2014 15504 7

Investigate the corner numbers 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 86 87 88 89 90 • 91 92 93 94 95 96 97 98 99 100 © www. teachitprimary. co. uk 2014 15504 The rectangle highlighted has four corner numbers: 5, 6, 35 and 36 Steps to investigation: Multiply each diagonal pair Find the difference Do this for other corner numbers Describe the pattern 8