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1.4 9 12 888
15
18
1 476 195 361
No matter in which order you multiply – answer remains the same.
1. MORE REVISION!
How many factors can you write down for each product?
E.g. 12 | 12 × 1 | 1.1 | ____________________ | |
2 × 6 | ____________________ | |||
3 × 4 | ____________________ | |||
4 × 3 | 42 | ____________________ | ||
6 × 2 | ____________________ | |||
1 × 12 | ____________________ | |||
____________________ | ||||
____________________ |
1.2 | ____________________ | 1.3 | ____________________ | |
____________________ | ____________________ | |||
____________________ | ____________________ | |||
64 | ____________________ | 72 | ____________________ | |
____________________ | ____________________ | |||
____________________ | ____________________ | |||
____________________ | ____________________ | |||
____________________ | ____________________ |
BRAIN-TEASER!
Find the following factors (you may use your calculator, if necessary):
a) 3 786
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b) 8 742
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1.4 Compete with a friend to see whose answers are written down first:
9 x 7 = 7 x__________________
716 x 18 = __________________
__________________ v 16 = 16 x 15
18 x 716 = 12 888
324 x __________________ = 18 x 324
563 v 347 = 195 361
1 476 x 326 = 326 x__________________
347 x 536 = __________________
DID YOU KNOW?
We call the above the COMMUTATIVE PROPERTY of multiplication.
DID YOU ALSO KNOW?
The ASSOCIATIVE PROPERTY of multiplication looks like this:
(6 x 5) x 2 = 6 x (2 x 5)
2 x (3 x 4) = (2 x 3) x 4
Thus, it makes no difference how we GROUP the numbers because the answer stays the same.
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 1.3: We know this when the learner recognises and represents the following numbers in order to describe and compare them:
1.3.6: multiples and factors of at least any 2-digit and 3-digit whole number.
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