# Sun-Yi estimated 270 + 146 and got 320. Is her estimate reasonable? Explain.

Sun-Yi estimated 270 + 146 and got 320. Is her estimate reasonable? Explain.
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Usamah Prosser
No. 146 can be estimated as 150 so that $270+150=420$, not 320. Sun-Yi forgot to carry over 1 to the hundreds digit.
Jeffrey Jordon