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• GETIntPhaseMaths

This module and collection are included inLens: Siyavula: Mathematics (Gr. 4-6)
By: Siyavula

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# To perform mental calculations

Module by: Siyavula Uploaders. E-mail the author

1.1 6

1.2 12

1.3 775

1.4 9

1.5 11

1.6 3 700

1.7 9 rem 3

1.8 6 rem 5

1.9 6 248

1.10 504

1.11 350

1.12 45

1.13 8

1.14 19 000

1.15 1 rem 16

## LEANER SECTION

### ACTIVITY: To perform mental calculations [LO 1.9.1, LO 1.9.2]

1. By this time you will have realised how important it is to develop a quick mind and do without a pencil and paper. Answer the following questions as quickly and accurately as possible and see whether you are able to improve on the results of your previous mental calculation test:

1.1 54 ÷ 9 = ________________________

1.2 __________________________ x 8 = 96

1.3 5 000 – 4 225 = ___________________

1.4 (7 x ____________________) + 9 = 70

1.5 (9 x 5) - ____________________ = 34

1.6 2 575 + 1 125 = ___________________

1.7 84 ÷ 9 = _________________________

1.8 53 ÷ 8 = _________________________

1.9 Double 3 124: ______________________

1.10 Halve 1 008: _______________________

1.11 250 + 75 + 25 = __________________

1.12 (12 x 12) - ___________________ = 99

1.13 (42 + _____________) x 1 000 = 50 000

1.14 Round off to the nearest 1 000: 19 450 : ___________________

1.15 (9 x 12) ÷ 92 = ________________________

Complete: I have _______________________________ correct!

 My marks have DROPPED REMAINED THE SAME IMPROVED

## 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 involving:

1.9.1: addition and subtraction;

1.9.2: multiplication of whole numbers to at least 12 x 12.

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