# 1.15 To recognise, describe and use laws

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## Memorandum

1.

1.1 9 + (8 + 7) = 24

1.2 121 + 32 = 153 / 140 + 13 = 153

1.3 338 + 100 = 438 / 396 + 42 = 438

Leaner Section

## Activity: to recognise, describe and use laws [lo 1.12]

1. Just as every country has certain laws to ensure good governance, there are "laws" or "characteristics" in Mathematics that can help you calculate answers more easily. There are, for example, the commutative and associative characteristics of addition. Complete the following and see how they work!

1.1 (9 + 8) + 7 = 9 + _______________ = _______________

1.2 121 + (19 + 13) = 121 + _______________ = _______________

(121 + 19) + 13 = _______________ + 13 = _______________

1.3 338 + (58 + 42) = 338 + _______________ = _______________

(338 + 58) + 42 = _______________ + 42 = _______________

1.4 Discuss with your classmates: Which grouping of addition numbers was the easiest? Why?

## Did you know

When we want to add numbers, we can calculate the answer quickly by ROUNDING OFF the numbers!

## 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.

1.12.3 the commutative, associative and distributive properties with whole numbers (the expectation is that learners should be able to use the properties, and not necessarily know the names.

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