3.17 To perform mental calculations

Mathematics

Measurement and time

Content

Educator section

Memorandum

1. 360

2. 0,36

3. 3

4. 0,036

5. 5,88

6. 6

7. 6,6

8. 20

9. =

10. =

11. =

12. =

13. =

14. =

15.>

1 ℓ = 4 cups

1 teaspoon = 5 mℓ

1 cup = 50 teaspoons

1 medicine measure = 5/10 mℓ

Leaner section

Content

Activity: to perform mental calculations [lo 1.9]

This is another opportunity to hone your mental calculation skills. Complete the following as quickly and accurately as possible.

1 3,6 × 100 = ______________________

2 3,6 ÷ 10 = _______________________

3 0,030 × 100 = ____________________

4 0,36 ÷ 10 = ______________________

5 3,42 + 2,46 = ____________________

6 3,75 + 2,25 = ____________________

7 10 - ______________________ = 3,4

8 10 ÷ 0,5 = ______________________

Fill in: =;>;<

9 3,4 km ________ 111 ________ 3 040 m

10 m ________ 111 ________ 63 cm

11 0,46 kg ________ 111 ________ 460 g

12 0,003 ℓ ________ 111 ________ 3 mℓ

13 km ________ 111 ________ 320 m

14 0,75 m ________ 111 ________ m

15 2 ℓ ________ 111 ________ 2,5 ℓ

Can you perhaps help?!

How many cups are there in 1 ℓ?______________________________________

• How many mℓ in one teaspoon? ______________________________________
• How many teaspoons in one cup?_____________________________________
• How many mℓ in one medicine measure?_______________________________

Assessment

Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.

Assessment Standard 1.9: We know this when the learner performs mental calculations