Their difference is 2 units. They reach equal amount with one decreasing and another increasing. Hence, 2 units = 27+5=32 1 unit = 32÷2=16 Should be able to carry on from here.

In order to have EQUAL units after Paul has saved $27 more n Smith spent $5, Paul has to add "certain units" n Smith has to cut "certain units". Both "certain units" = 2 units since Smith has 2 more units than Paul. 2 units = $32 Hope it helps you how to start n to draw the models. :)

A visual way

Thank all for your help

2U => $27+$5 => $32 1U => $16 Smith saving at first 7U => 7 x $16 => $112

6 units ~ 678 4 units ~ (6/4x678)452

tyvm!

This model drawing method is very important. Primary sch Maths uses this method from now onwards. You will see more when they go higher level.

1st evening: women = 100 units men = 100 units + 70 2nd evening: women = 100u + 20u = 120 u men = 90u + 63 (since decreased by 10%, remaining would be 90% of 100u and 90% of 70) Hope the guided steps help. :)

Thank you so much Yueh Mei n Poh Ann.😃

This is a good question. Set within the syllabus and not convoluted.

My son feels otherwise though😂😂😂

It's good cos it tests on the concept without getting into 'parts' and 'units' which conceptually is beyond requirement.

tyvm!

thks for the v detailed visual explanation!

Very obvious

Confirm i nvr learn this before. Lol

45

The 1st one. Which number adds to itself 3 times, and the 2nd digit returned is itself? 4+4+4=X2, 6+6+6=X6, so it will be 5+5+5=X5. S=5, I=1.

on the 3rd one. Which number multiplies itself and returns the 2nd digit as itself? 7x7=X9, 5x5=X5. This can be the answer, but 5 is already taken by S. So use 6x6=X6, A=3, T=6.

Hi Caleb Tey, thanks for your help. I haf a better understanding now!

on the 2nd, if a double digit number + a single digit number, the maximum that the new number can increase is by 1, in the tens placing. As such, we can establish that O-1=N. Since O+O=XN, O can only be 9, since 9+9=x8. So O=9, N=8.