Hi, Maya Tharangani. Observe the patterns below for the shaded and total squares. Total squares in a figure. Figure 1: 1 square Figure 2: 2x2 squares Figure 3: 3x3 squares Figure n: nxn squares Shaded squares: Figure 1: 1 Figure 2: 2x2 - 1x1 Figure 3: 3x3 - 2x2 Figure n: nxn - (n-1)(n-1) :)

Shaded sqs Fig 1 : 1 Fig 2: 2 + 1 Fig 3: 3 + 2 Fig 4: 4 + 3

The Ist one is a quadratic and second one is an arithmetic sequence with a diffrence of 2.

Yes but this is primary school. Can don't b so chim?

Hi, Maya Tharangani. Observe the pattern below for the number of squares. Figure 1: 1 Figure 2: 1+2 Figure 3: 1+2+3 Figure n: 1+2+3+...+n :)

Same as the dots question in your 1st picture

This is the triangular sewuence

A= 3u B= 1u 2u = 165+45 =210 1u = 210/2 = 105 B = 105

After cut is 165cm shorter, so before cut is 165 + 45 = 210cm 210 is refer to the difference in length btwn rope a and b Then divide 2 and get 110cm as answer

understood and thank you

(165+45)÷2=105

Thank you very much :)

thank you!!!

My pleasure.

1 apple cost $0.75 5 pears and 1 apple cost as much as 2 pears and 2 apples. So 3 pears is the same price as 1 apple. So 1 pear is $0.25 So 100 pears will cost $25. And 450 apples will cost $337.5 To total cost would be $362.50

Hi, Derek Toh. Cost of 3 pears is the same as 1 apple if you observe the first sentence carefully. :) For example, If I have to buy 1 more apple, I have to give up the buying of 3 pears.

Thank you for the help!

bar models,

Thank for the help!

Thank you for the help!