Correct: halve of 1000 =500, halve of 900 = 450, half of 940 = 470, half of 800 = 400, half of 880 = 440, half of 700 = 350, half of 730 = 365, half of 600 = 300, half of 640 = 320, half of 550 = 255, Incorrect: half of 1000 = 400, half of 900 = 350, half of 600 = 250, half of 700 = 300, half of 800 = 500, half of 500 = 230, half of 640 = 220, half of 420 = 120, half of 840 = 540,

halving using multiples of 10

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