Emma calculated 1,458,732 + 786,945 = 2,145,577. What mistake did Emma make?, She forgot to regroup in one place., She added correctly., She should have subtracted instead., She added the digits from right to left., Ben calculated 2,000,000 − 875,460 = 1,124,540. Is Ben's answer correct?, Yes, No, the correct answer is 1,124,640., No, the correct answer is 1,134,540., No, the correct answer is 1,214,540., Two students solved 1,683,420 + 295,680. Emma's answer is 1,979,100. Ben's answer is 1,969,100. Who is correct?, Both, Neither, Emma, Ben, A student estimated 1,782,540 + 614,920 ≈ 2,400,000. Is this estimate reasonable?, Yes, No, it should be about 2,300,000., No, it should be about 2,500,000., No, it should be about 2,600,000., Which statement best explains why we estimate before calculating?, To avoid regrouping., To make the numbers smaller., To replace exact calculations., To check whether the final answer is reasonable., Emma says, "If my exact answer is very different from my estimate, I should check my work again." Is Emma correct?, Yes, No, Only for subtraction., Only for numbers less than 1,000., Which student's method is more reliable for checking an addition problem? Emma estimates the answer first and then compares it with her exact answer. Ben only checks the last digit., Both, Neither, Ben, Emma, Why is it important to explain your mathematical reasoning when correcting a mistake?, It makes the numbers larger., It helps others understand why the solution is correct., It changes the answer., It avoids using place value.

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