Mental Arithmetic 4 (by Schofield & Sims) - Solution to Section 1 | Test 1A
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Solutions
Question 1: Write in words the number shown on the abacus.
Question 2:
Question 3: \(9653 - 601 =\)
Question 4: \((8 \times 7) + 5 =\)
Question 5: \((56 - 8) \div 8 = \)
Question 6: \(\frac{7}{10} \: of \: 100 \: g = \)
\( = \frac{7\times 100}{10} g \)
\( = \frac{700}{10} g \)
\( = 70 g\)
Answer = 70 g
Question 7: \(1\frac{3}{4} \: h=\_\_\_ \: min\)
\( = \frac{7}{4} \times 60 \: minutes \)
\( = \frac{420}{4} \: minutes \)
\( = 105 \: minutes \)
Answer = 105 minutes
Question 8: \(£1.45=\_\_ \: 5ps\)
\( £1.45 \: pounds = 1.45 \times 100 = 145 \: pence \)
Divide by the value of a 5p coin
\(145 \div 5 = 29 \)
Answer = 29
Question 9: \(4km \: 350m = \_\_ \: m \)
\( 4km = 4 \times 1000m = 4000 m \)
\( 4000 m + 350 m = 4350 m \)
Answer = 4350 m
Question 10: \(850g + \_\_ \: g = 1 \frac{1}{2} \: kg\)
Since 1kg = 1000g
\( \frac{3}{2} \: kg = \frac{3}{2} \times 1000 \: g = \frac{3000}{2} \: g = 1500 \: g \)
Subtract 850g from 1500g
\( 1500g - 850g = 650g \)
Answer = 650g
Question 11: \( £7.09 = \_\_ \: p \)
\( £7.09 = 7.09 \times 100 = 709 \: pence \)
Answer = 709
Question 12: \(\_\_ \: 10ps + six \: 2ps = £1.82\)
£1.82 = 182p \( Six \: 2p \: coins = 6 \times 2 = 12p \)
Let the number of 10p coins be \( x \)
\( 10x + 12 = 182 \)
\( 10x = 182 - 12 \)
\( 10x = 170 \)
\( x = \frac{10}{10} = 17 \)
Answer = 17
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