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Published byJason Brooks Modified over 7 years ago

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Lesson 17

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Addends- The numbers that are being added together. Reasonable- Does it make sense?

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First we find the nearest hundred. 362 ~ 400 159~200 Then we round to the nearest ten. 362~ 360 159~ 160 Then we round to the closest 50. 360~350 159~150

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362 + 159 400 + 200 = 600 (Rounding to nearest hundred) 360 + 160 = 520 (Rounding to nearest ten) 350 + 150= 500 (Rounding to nearest 50) Which method of rounding will give the closest sum? Talk to your neighbor about your answer.

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(A) 349 + 145 (B) 352 +145 (C) 352 + 151 Round to the nearest hundred Round to the nearest ten Round to the nearest 50 What did you realize about these numbers? Find the exact value of the sums.

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296 + 609 Round to the nearest hundred Round to the nearest ten Round to the nearest 50 What did you realize about these numbers? Find the exact value of the sums.

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