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Estimations, equations and variables

Educator section


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

Leaner section


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 = _______________.......


Complete by colouring in the appropriate block:

I have performed


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.

Questions & Answers

price elasticity of demand is the degree of responsiveness of a quantity demanded to the change in price of the commodity in question.
Gladys Reply
what is the importance of learning economics?
Thelma Reply
it helps to make the correct choice
it helps firm to produce products that will bring more profit
the difference between needs and wants
londiwe Reply
needs are things that we basically can't live without wants are just luxury things
needs are things without them we can't live but want are things without we can live
what is education
it's a process in which we give or receiving methodical instructions
what is mixed economy
what is a deadweight loss? how monopoly creates a deadweight loss?
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what is type of economic
taiwo Reply
how to understand basics of economics
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what is demand schedle
Princess Reply
When you make a Scedule of the demand you made
this is helpful for rbi grade b
Prema Reply
What is macroeconomics
Kauna Reply
It's one of the two branches of Economics that deal with the aggregate economy.
it's about inflation, occupation, gdp and so on
What is differences between Microeconomics and Macroeconomic?
microeconomics focuses on the action of individual agents in the economy such as businesses, workers and household. while macroeconomics looks at the economy as a whole. it focuses on broad issues in the economy such as government deficit, economy growth, levels of exports and imports, and
inflationary increase in prices
a price floor of 24 imposed
Annie Reply
monopolistic competition
bintu Reply
any one there to answer my question
Richard Reply
Fixed Costs per week Variable Costs per bear Rent & Rates of Factory Hire & machines Heating & Lighting Repayment of Bank Loan K100.00 K45.00 K5.00 K50.00 Materials Foam Wages K6.00 K1.00 K1.00 Total K200.00 K8.00
one of the scarce resources that constrain our behaviour is time. each of us has only 24 hours in a day. how do you go about allocating your time in a given day among completing alternatives? once you choose a most important use of time. why do you not spend all your time to it. use the notion of op
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mani Baba. First learn the spelling of Economics
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Economics- The study of how people use their limited resources to tey and satisfy unlimited wants.
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in a comparison of the stages of meiosis to the stage of mitosis, which stages are unique to meiosis and which stages have the same event in botg meiosis and mitosis
Leah Reply
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Source:  OpenStax, Mathematics grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11075/1.1
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