By Ole Steen Hansen
Marking the a hundredth anniversary of the Wright brothers' first flight,
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An evidence of the technology of numbers and house, with easy demonstrations of mathematics, algebra, trigonometry, arithmetic in tune and paintings, and together with a few methods and video games utilizing numbers.
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3 weeks 6 days Ϫ 2 weeks 2 days 4 days Subtract weeks. 3 weeks 6 days Ϫ 2 weeks 2 days 1 week 4 days You will have 1 week and 4 days left. 40 Time Let’s do one that uses hours and minutes. 12 hours 37 minutes Ϫ 6 hours 16 minutes Subtract minutes first. 12 hours 37 minutes Ϫ 6 hours 16 minutes 21 minutes Subtract hours. 12 hours 37 minutes Ϫ 6 hours 16 minutes 6 hours 21 minutes 41 Subtraction L ook at the question “You have 9 oranges. ” The words left and take away tell you that you should subtract.
Subtract the number of points the score was decreased by from last week’s score. 32,000 score last week Ϫ 4,000 decrease in score 28,000 score this week 4 Check your work. Make sure you have answered the right question. Remember, you can use addition to check your subtraction. 28,000 ϩ 4,000 ϭ 32,000 45 Further Reading Cato, Sheila, and Sami Sweeten. Subtraction. Minneapolis: Carolrhoda Books, 1999. Creative Teaching Press. Addition and Subtraction Facts to 20. : Creative Teaching Press, 2002. Leedy, Loreen.
R ounding to a smaller place value gives a closer estimate than rounding to a larger place value. A. Estimate 637 Ϫ 82 to the hundreds place. Write the numbers in columns. Round each to the nearest hundreds. 637 rounds to 600 Ϫ 82 rounds to 100 Subtract. 600 Ϫ 100 500 B. Estimate 637 Ϫ 82 to the tens place. Write the numbers in columns. Round each to the nearest tens. 36 637 rounds to 640 Ϫ 82 rounds to 80 Exact Difference 5 14 Subtract. Regroup 1 hundred as 10 tens. 640 Ϫ 80 560 C. Find the exact difference.