Lesson: Estimating Sums of Three-Digit Numbers: Rounding Mathematics • Second Year of Primary School

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In this lesson, we will learn how to round to the nearest ten or hundred to estimate the value of sums up to 1000.

Students will be able to

identify the digit with the highest place value in a three-digit number,
round three-digit addends to the highest place value,
estimate the sum of three-digit numbers by rounding to the nearest ten or hundred,
estimate the sum of three-digit numbers by rounding to the highest place value,
compare the accuracy of different estimates.