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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

## Memorandum

1. inverse

2. dividend; kwotient; divider

3. remainder

4. one

5. naught

6. halve

## Content

### Activity: To perform mental calculations [LO 1.9.3]

For a long time you have known how important it is to be able to do mental calculations. By now you probably also know your multiplication tables very well! But how well do you know division tables? Decode the following as quickly as you can:

 A D I E C Y L M O N V N U F 7 12 5 4 8 6 10 3 2 14 11 9 13 1

LET US REVISE!

The answers to the following questions are hidden in the word search. Look for the answers with a friend and then colour in neatly.

 N O U G H T L Y Q K A S I O D Y R U W E S N P I H E O H A L V E V R M T B F P E O I G A I T J A R F D V I E I R E S D E H N N M W H E G N U D T O N E J R D S E Q C D I V I D E R E

1. Division is the ___________________________________ of multiplication.

2. In 3 860 ÷ 20 = 193 is

3 680 the ____________________________________

193 the ______________________________________ and

20 the _______________________________________

3. If a number can’t be divided precisely into a dividend, we call the amount that is left over, the ________________________________________________________

4. Any number that is divided by______________________________________

remains unchanged.

5. Division by_____________________________________________________

is undefined.

6. If we ___________________________________ a number, we divide it by 2.

## 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:

1.9.3: division with small numbers.

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