# CTSC Maths Thinker – Week 6

Categories: What's on

### Grade 4 - 7

**Take our daily marvellous Primary School Maths Thinker to sharpen your mind and enhance your skills. Find curriculum-aligned maths questions to help your child explore essential concepts. Daily questions will be posted Monday to Thursday for Grade 4 – 7 respectively. Look out for the solutions to these questions every Friday (all grades).** The CTSC Education Team will be standing by should you have any questions – please reach out by posting any questions on our Facebook or Instagram page in the comments section. #CTSCMaths

**Grade 7**

**This week we will be doing a bit of MENTAL MATHS with the Grade 7 learners. Scroll through the images for the questions and images linked to the questions.**

**QUESTIONS**

1. The rectangular playground in Dumisa’s school is three times as long as it is wide. The area of the playground is 75 square meters. What is the perimeter of the playground?

2. Calculate the circumference of a circular field whose radius is 5 centimetres

3. Tebogo spent 3/4 of his savings on furniture and the rest on a TV. If the TV cost him R200, what were his original savings?

4. If the length of the side of a square is doubled, what is the ratio of the areas of the original square to the area of the new square?

5. R is one of the numbers below. R is such that when multiplied by 0.5 gives 0.75. Which number is equal to R?

A. 1 1/2

B. 1 1/3

C. 5/3

D. 3/2

6. Order from least to greatest: 3 4/7 , 3 3/5 , 3 1/2 , 3 11/20.

A. 3 1/2 , 3 11/20 , 3 4/7 , 3 3/5

B. 3 1/2 , 3 3/5 , 3 11/20 , 3 4/7

C. 3 1/2 , 3 3/5 , 3 4/7 , 3 11/20

D. 3 3/5 , 3 1/2 , 3 11/20 , 3 4/7

7. There are 25 shops, and 500 shoppers of which 300 are men. Find the ratios

A. total of shoppers to shops

B. men to shops

8. 2/5 ÷ 6

9. Write as a fraction 6/50+2/25 + 8

10. 1/4 (5 +7 x 3)

THE ANSWERS – Grade 7**Grade 6**

**This week we will be doing a bit of MENTAL MATHS with the Grade 6 learners. Scroll through the images for the questions and images linked to the questions.**

**QUESTIONS:**

1. Which of these numbers is not a multiple of 6? – 36, 42, 46, 54, 60, 72

2. Solve 3x = 24

3. What is the missing angle? (See image)

4. Akhona sells 40 sweets and makes R32. How much did she sell each sweet for?

5. Identify the acute angles. How many are there? (See image)

6. A border collie runs at 30 km per hour for 30 minutes. How far has it run?

7. 0,25 + 0,5 + _____ = 1

8. If x = 4, what is the value of (3x + 9) ÷ 3

9. The perimeter of a rectangle is 12 cm. The area is 5 cm². What is the length of the sides?

10. 1746 ÷ 100 =

11. 68,93 = 68 + 0.9 + _____

12. The time is 12:00am. What is the 24-hour clock time?

13. 3/5 of 25

14. Write down all the prime numbers between 20 and 30

15. Add up all the odd numbers between 32 and 38

16. A scale model of a locomotive is made with a ratio of 1:50. The length on the scale model is 5 cm. How long is the actual locomotive?

17. Convert 18/5 to a mixed number.

18. 1/4 + 1/8 =

19. How many edges? (See image)

20. How many cups (250ml) makes 5 litres?

**Grade 5**

**This week we will be doing a bit of MENTAL MATHS with the Grade 5 learners. Scroll through the images for the questions and images linked to the questions.**

**QUESTIONS:**

1. Convert 3 2/4 into a decimal fraction

2. Round 7,745 to the nearest whole number

3. Find 3/4 of 24

4. Which is the largest? – 0,53 0,73 0,8 0,06 0,68 0,45

5. What is the median: 32, 43, 59, 25, 18, 36, 27

6. Azi has R70. Thembi has a R10 note plus five R5 coins. How much more money does Azi have?

7. Unathi pays R24 for two slabs of chocolate: a mint chocolate and a caramel chocolate. The mint chocolate costs R6 more than the caramel chocolate. How much did each chocolate cost?

8. What is the missing angle? (See image)

9. If x + 7 = 15, what is the value of x ?

10. 1/5 + 1/3 =

11. I am between 20 and 30. I am a multiple of 3 and 4. Who am I?

12. 5 x 6 = 35 –

13. The time is 8:45pm. What is the time in the 24-hour clock?

14. 0,4 x 3 =

15. How many lines of symmetry? (See image)

16. How many millimetres in 7½ centimetres?

17. I am facing west. I turn a right angle anti-clockwise. What direction am I facing now?

18. 0,45 = ____ = 1

**Grade 4**

**This week we will be doing a bit of MENTAL MATHS with the Grade 4 learners. Scroll through the images for the questions and images linked to the questions.**

**QUESTIONS:**

1. Write down the number one thousand four hundred and six

2. Round 962 to the nearest 100

3. Write down 3 odd numbers that add up to 17

4. What is the number in this sequence? 53, 50, 47, 44, 41, ____

5. Write down a multiple of 6 between 40 and 50

6. A ladder is 6 _____ tall. Which word is missing? (mm cm m km)

7. What number comes halfway between 4 and 5?

8. What is the half of 54?

9. ____ – 6 = 13

10. 27 ÷ 3 =

11. What is the perimeter of this rectangle? (See image)

12. What is the time in digital? (See image)

13. I have R1. If I send 43c. How much do I have left?

14. The date is the 22nd May. What was the date 3 weeks ago?

15. How many wheels on 7 cars?

16. How many FIVES make 7 TENS?