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• GETIntPhaseMaths

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# To use divisibility rules

Module by: Siyavula Uploaders. E-mail the author

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

### 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:

 Tick the applicable block Not at all Very uncertain Somewhat uncertain Very well I know my ÷ tables. (LO 1.9) ____ ____ ____ ____ I knew most of the revision questions. (LO 1.12) ____ ____ ____ ____ I can formulate rules for division by powers of 10 (10 ; 100 ; 1 000 ; 10 000) (LO 1.12) ____ ____ ____ ____ I can divide correctly by 1 000 (LO 1.12) ____ ____ ____ ____ I can divide correctly by 10 000 (LO 1.12) ____ ____ ____ ____ It is easy for me to divide by 10 and 100 (LO 1.12) ____ ____ ____ ____

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.

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