2.14 To use divisibility rules

Mathematics

Multiplication

2.3 1.1 12

1.2 6

1.3 9

1.4 8

1.5 5

1.6 12

1.7 45

1.8 50

1.9 900

1.10 500

1.11 580

1.12 100

1.13 2

1.14 12,5 / 12½

1.15 6

Leaner section

Content

Activity: to use divisibility rules [lo 1.12.1]

Now you can test your skill in division and use the new knowledge that you have gained effectively. Let us see how you cope with the following mental calculation test. Write down answers only, as quickly as you can.

1.1 72 ÷ 6 = ___________________

1.2 54 ÷ 9 = ___________________

1.3 63 ÷ 7 = ___________________

1.4 48 ÷ ___________________ = 6

1.5 35 ÷ ___________________ = 7

1.6 108 ÷ ___________________ = 9

1.7 ___________________ ÷ 5 = 9

1.8 4 500 ÷ ___________________ = 90

1.9 45 000 ÷ 50 = ___________________

1.10 45 000 ÷ ___________________ = 90

1.11 5 800 ÷ 10 = ___________________

1.12 8 900 ÷ ___________________ = 89

1.13 2 420 ÷ 20 = (2 420 ÷ 10) ÷ ___________________

1.14 A half ´ 25 = ___________________

1.15 (30 ÷ 5) = (36 ÷ ___________________)

15

Fill in: I got ___________________ correct!

TIME FOR SELF-ASSESSMENT!

How well do you know the work we have done up to now? Indicate this by marking the appropriate block:

BRAIN-TEASER!

Francois has a bag of marbles. If he divides them into groups of 4, 2are left over. If he divides them into groups of 5, 1 is left over. How many marbles can there be in his bag? Could you write down 5 possible answers in the bag?

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 1.12: We know this when the learner recognises, describes and uses:

1.12.1: divisibility rules for 2, 5, 10, 100 and 1 000.