Estimating Sums and Differences | MathHelp.com - Free Educational videos for Students in K-12 | Lumos Learning

Estimating Sums and Differences | MathHelp.com - Free Educational videos for Students in k-12


Estimating Sums and Differences | MathHelp.com - By MathHelp.com



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00:0-1 Here we are asked to estimate the sum of 4909
00:06 and 3217 . by rounding each number to the nearest
00:09 1000 In 4909 . The four is in the rounding
00:14 place . So we look at the digit to the
00:17 right of the four . The nine in this position
00:20 tells us to round up . So we add one
00:23 to the digit in the rounding place to get five
00:26 and we change all digits to the right of the
00:29 rounding place to zero . So 4,909 rounds up to
00:36 5000 In 3217 . The three is in the rounding
00:42 place . So we look at the digit to the
00:44 right of three . The two in this position tells
00:48 us to round down , so the digit in the
00:50 rounding place three stays the same And we change all
00:54 digits to the right of the 3-0 . Yeah ,
00:58 yeah , So 3,217 rounds down to 3000 and we
01:04 have 5000 plus 3000 which is 8000 . So we
01:12 can estimate that the sum of 4,909 and 3,217 is
01:18 8000 .
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