20 x 200 = 4000 - John lives 16 miles from school and goes to work 195 days a year - estimate the total distance travelled, 20 x 400 = 8000 - Sam does 24 sit-ups every day. How many will he do in a year?, 120 x 40 x 50 = 240000 or 100 x 40 x 50 = 200000 - A machine operator produces 121 microchips every hour. He works 39 hours a week for 47 weeks a year. Estimate his annual microchip production., 700/25 or 20 = 28 or 35 - Fay sold 24 teddy bears for £696. Estimate the price of each toy,

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