# CTSC Maths Thinker – Week 10

Categories: What's on, What's on this month

### 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

**Multiply and divide these mixed fractions**

1. 5/7 x 4 1/5=

2. 8 1/3 x 3 3/10 =

3. 6 1/8 x 4 4/7 =

**Finding the percentage**

4. 90% of 46 =

5. 52% of 16 =

6. 16% of 81 =

**Multiplying decimals**

7. 705.8 × 100 =

8. 0.4988 × 10 =

**Word problems**

9. Julie bought 2.5 kg of cake flour, 5.34 kg of sugar and 0.35 kg of margarine butter. What is the total weight of the things bought by Julie?

10. Gary is 1.76 metres tall and MJ is 0.12 meters taller. What is MJ’s height?

THE ANSWERS: Grade 7### Grade 6

This week we will be having a bit of fun with MENTAL MATHS for the Grade 6 learners.

**QUESTIONS:**

1. 180 ÷ 2

2. How many edges does the shape have? (See image)

3. Round 5.27 to the nearest decimal

4. James and Gerhard are brothers whose ages add up to 36. If James is 12 years old, how old is Gerhard?

5. How long is the line? (See image)

6. Which number is the greatest? 0.37 0.193 0.60 0.472 0.22

7. What is the length of the sides of a square if the perimeter is 32?

8. Which number is in the tens position in 4 352?

9. Write down all the factors of 45

10. What is the mode of 1, 6, 8, 4, 0, 6, 9 and 2

11. 23 – 6 x 3

12. The radius of a circle is 12 cm. What is the diameter of this circle?

13. Write 2 3/4 as an improper fraction

14. If x = 7 , what is the value of (χ+5)/4 (See image)

15. A soccer team played 28 games. They won 17 of the 28 games. What is the ratio of games won to games lost?

16. How many prime numbers are there between 15 and 30?

17. If the cost to ride the Human Gyroscope at the Cape Town Science Centre is R5 per child, how many children rode the Human Gyroscope if the total money received on a day was R125?

18. Round each factor to the nearest ten, then estimate the product of 75 and 49.

19. What is the lowest common denominator of 5/8 and 6/16

20. Write 1/5 as a decimal

### Grade 5

This week we will be having a bit of fun with MENTAL MATHS for the Grade 5 learners.

1. 8 + (6 x 7)

2. 3/5 + 3/10 =

3. What is the range of: 21, 35, 17, 28, 33, 13 and 31

4. Which of these numbers is prime? 32, 45, 57, 69, 53, 49

5. How many months in 2/4 of the year?

6. Which 2 measurements add up to 3 meters? 200cm, 150cm , 200mm, 1m, 300mm

7. What 3D shape does this net make? (See image)

8. Fill in > or <

9. There are 100 learners in Grade 5. If 65% of them are girls, how many are boys?

10. What is the time 4½ h before 7:30 pm?

11. What is heavier? (See image)

12. Write 400/1000 in its simplest form.

13. Write 75 in a Roman numeral.

14. Find the H.C.F of: 20, 30 and 50

15. Find the L.C.M of: 8 and 12

16. 45 trees are planted in rows of 5. How many rows of trees are planted?

17. Write the number: Seventy two thousand nine hundred and four.

18. How many years and months are equal to 37 months?

19. What is the perimeter of a building that is shaped as a pentagon with each side

20. How many dozens can be made up from 84 eggs?

### Grade 4

**This week we will be having a bit of fun with MENTAL MATHS for the Grade 4 learners.**

1. A semicircle measures _____. (See image)

2. What is the place value of 6 in 654 392?

3. C is the Roman numeral for?

4. Write the largest number with the following digits: 2, 1, 3 and 5.

5. Write in figures 3 thousand and six.

6. The time is 8:35pm. What time will it be after 2 hours?

7. The perimeter of a rectangular field is 100m. Its length is 40m. Find its width

8. 6 minutes 3 seconds = ____ seconds

9. Round off the number 76543 to the nearest 100.

10. 7 x ___ = 14 x 2

11. Use the number patterns to complete the last line. (See image)

12. This diagram shows that the fraction ¼ is the same as the fraction ___. (See image)

13. XXIV + XVIII = ____

14. Five tens + 32 = ____

15. Which bucket holds more water? (See image)