Math Estimation Techniques and Practice Problems
Explore math estimation techniques through practice problems involving rounding numbers to the nearest thousand and ten thousand. Estimate shop earnings and consider true or false statements. Enhance your understanding of constant difference and make accurate estimations for various scenarios.
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Presentation Transcript
1) 7,116 3,655 = 2) 51,540 + 5,154 = 3) Round 84,564 to the nearest 1,000 4) Round 84,564 to the nearest 10,000
1) 7,116 3,655 = 3,461 2) 51,540 + 5,154 = 56,694 3) Round 84,564 to the nearest 1,000 85,000 4) Round 84,564 to the nearest 10,000 80,000
Hang on, Ill just work it out the numbers yet! How?! I haven t written I have 3,800 in my bank. Can I afford to buy the TV and laptop? STOP! I already know he can 2 1 afford it. 1 3 8 . 9 5 +
I rounded 2,138.95 to 2,100 I rounded 1,219.40 to 1,200 2,100 plus 1,200 is 3,300 so Ron has enough money
An estimate a sensible but not exact answer.
7,116 3,655 = 7,000 7,116 rounded to the nearest 1,000 is 4,000 3,655 rounded to the nearest 1,000 is 7,000 4,000 = 3,000 7,100 7,116 rounded to the nearest 100 is 3,700 3,655 rounded to the nearest 100 is 7,100 3,700 = 3,400 Have a think Which is the more accurate estimate?
Shop A 4,000 Shop B 6,231 9,199 Shop C 2,002 14,508 Morning Afternoon 11,613 Estimate which shop made the most money. Shop C That s already rounded to the nearest 1,000! Shop A: 4,000 + 12,000 = 16,000 Shop B: 6,000 + 9,000 = 15,000 17,000 Shop C: 2,000 + 15,000 = Have a think Did shop B make more or less than 15,000? More
Have a go at questions 1 - 5 on the worksheet
True or false? 3 6 9 83,155 + 542 > 524 + 83,155 True 5 3 Have a think 1 1 8 What s stayed the same? What s changed? constant difference 25,501 1,000 = 25,500 999 True Have a think 1 less 1 less What s stayed the same? What s changed?
Have a go at the rest of the worksheet
