# 2.1 Estimations, equations and variables (mental calculation test

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4. Own attempts

5. (a) 202

(b) 485

(c) 8

(d) 8

(e)` 7

(f) 56

(g) 820

(h) 96

(i) 470

(j) 18 400

(k) 40

(l) 64

(m) 10 000

(n) 64

(o) 1 000 000

## Activity: estimations, equations and variables (mental calculation test) [lo 1.7.2, lo 1.7.7, lo 1.8, lo 1.10]

4. Brainteaser!

Can you form a square / rectangle / triangle with the following seven tangram pieces?

Trace the shapes on a separate sheet of paper, cut them out and arrange the pieces. Then glue them in a frame..

5. Let's first see how you cope with "ordinary" numbers!

Complete the following mental calculation test as quickly and accurately as possible:

a) 179 + 23 = _______________

b) 512 – 27 = _______________

c) 9 x _______________ = 72

d) _______________ x 6 = 48

e) 63 ÷ 9 = _______________

f) _______________ ÷ 8 = 7

g) 24 600 ÷ 30 = _______________

h) (60 ÷ 5) x (32 ÷ 4) = _______________

i) 3 x 47 + 7 x 47 = _______________

j) 25 x 184 x 4 = _______________

k) 158 – 130 + 12 = _______________

l) 82 = _______________

m) 1002 = _______________

n) 43 = _______________

o) 1003 = _______________.......

15

Complete by colouring in the appropriate block:

I have performed

## 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 1.7: We know this when the learner estimates and calculates by selecting and using operations appropriate to solving problems that involve:

1.7.2: multiple operations with integers;

1.7.7: exponents.

Assessment Standard 1.8: We know this when the learner performs mental calculations involving squares of natural numbers to at least 10 2 and cubes of natural numbers to at least 5 3 ;

Assessment Standard 1.10: We know this when the learner uses a range of strategies to check solutions and judges the reasonableness of solutions.

how can chip be made from sand
is this allso about nanoscale material
Almas
are nano particles real
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
no can't
Lohitha
where is the latest information on a no technology how can I find it
William
currently
William
where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
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learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
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revolt
da
Application of nanotechnology in medicine
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Kamaluddeen
yes
narayan
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Bhagvanji
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Damian
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I think
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brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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