1.20 To be able to do mental arithmetic

Mathematics

Number concept, addition and subtraction

Addition

Educator section

Memorandum

1.1 830

1.2 14

1.3 12

1.4 99

1.5 27

1.6 12 and a half

1.7 84

1.8 185

1.9 196

1.10 64

1.11 29 and a half

1.12 5

1.13 7

1.14 158

1.15 60

1.16 7

1.17 8

1.18 80

1.19 0

1.20 170

Leaner section

Content

Activity: to be able to do mental arithmetic [lo 1.9]

• In this activity it is time again for YOU to rack your brains a bit and to try to enhance your mental arithmetic abilities. See whether you can write down the correct answers of the mental arithmetic test within three minutes!

a) 550 + 280 = ____________

b) 18 + ____________ = 32

c) 28 + ____________ = 40

d) 105 – 6 = ____________

e) 3 × 3 × 3 = ____________

f) Halve van 25 = ____________

g) ____________ ÷ 12 = 7

h) 193 – 8 = ____________

i) 203 – 7 = ____________

j) Halve 128: ____________

k) Halve 59: ____________

l) 20 ÷ ____________ = 4

m) 63 ÷ ____________ = 9

n) Double 79: ____________

o) (6 × 9) + 6 = ____________

p) (7 × 8) + . ____________ = 63

q) (____________ × 5) + 9 = 49

r) 2 × 20 × 2 = ____________

s) ____________ × 12 + 12 = 12

t) Double 85: ____________

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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.