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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