Hello, today we will look at word problems involving four operations. The most common word problem on four operations in the SATs follows the structure of problems like 'I have a number, I multiply it by 4 , then I add 9 and divide it by 3. My final number is 11 , what was my original number ? ' . To do these problems you should do the inverse operations to the final number in the opposite order so to solve the above problem you should do 11x3=33-9=24/4=6. Other problems mix four operations with other topics such as measurement and fraction . To do these problems you should know what the problem is asking you to do . To work this out should know what certain words mean like decrease means subtract. Then you should show your working out and write your answer.
Now that you know how to answer these questions try these :
Mild:
1.I have a number , I times it by 6 , add 13 and divide it by 5 . I now have 11.What was my original number? 2.My ribbon is 1.35 metres long but Jack cut off 25 cm . I then sew on another half of what is left , how long is my ribbon now?
Medium:
1.My number is 15 . I do 3 different things to it to get 50 . What could I have done ?
2.I have £4.85 , I lose £1.50 but then I find a £2 coin . In happiness, I spend 65p on a choclate bar. How much money do I have left?
Hot:
1.Red land and Blue land are ancient tribes. Blue land is 145,900 km squared whilst Red land
is 125,600 km squared . They both break out in war and Red land gains 2,350 squared km of area but half of it is soon taken over. How large is each tribe now?
2. I have a number , I multiply it by 6 , add 8 , divide it 4 and subtract 0.5 . My new number is 69 , what was my original number ?
