28=7x - 4, 1= \frac{x}{7} - 7, \frac{x}{5}=7 - 35, 8,12,?,20 - 16, 11,10,9,? - 8, \sqrt{9} - 3, \sqrt{100} - 10, 10 \div 2 - 5, 36 \div 4 - 9, 4 \div 2 - 2, 4 \times 7 - 28, 12 \times 12 - 144,

Mental Maths

Created byfern3

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