1. Estimate each of the following using general rule:
(a)
837 + 987
(b) 783 – 427
(d) 28292 - 21496
(c) 1391 + 2783
please help me
Answers
Step-by-step explanation:
Solution 1:
(a) 730+998730+998
Rounding of to nearest hundred
730\Rightarrow700730⇒700 and 998\Rightarrow1,000998⇒1,000
730+998\ \Rightarrow\ 700+1,000730+998 ⇒ 700+1,000
= 1,700
(b) 796-314796−314
Rounding of to nearest hundered
796\Rightarrow800\ \ and\ \ 314\Rightarrow300796⇒800 and 314⇒300
796-314\ \Rightarrow\ 800-300796−314 ⇒ 800−300
= 500
(c) 12,904+2,88812,904+2,888
Rounding off to nearest thousand
12,904\Rightarrow13,000\ \ and\ \ 2,888\Rightarrow3,000\12,904⇒13,000 and 2,888⇒3,000 12,904+2,888\ \Rightarrow\ 13,000+3,00012,904+2,888 ⇒ 13,000+3,000
= 16,000
(d) 28,292-21,49628,292−21,496
Rounding off to nearest thousand
28,292\Rightarrow28,000\ \ and\ \ 21,496\Rightarrow21,00028,292⇒28,000 and 21,496⇒21,000
28,292-21,496\ \Rightarrow\ 28,000-21,00028,292−21,496 ⇒ 28,000−21,000
= 7,000
10 more examples :-
Example 1:
1,246+5,822\ \Rightarrow\ 1,200+6,000\ =\ 7,2001,246+5,822 ⇒ 1,200+6,000 = 7,200
Example 2:
333+737\ \Rightarrow\ 300+700\ =\ 1,000333+737 ⇒ 300+700 = 1,000
Example 3:
23,489-13,503\ \Rightarrow\ 23,000-14,000\ =\ 9,00023,489−13,503 ⇒ 23,000−14,000 = 9,000
Example 4:
11,307-10,312\Rightarrow\ 11,000-10,000\ =\ 1,00011,307−10,312⇒ 11,000−10,000 = 1,000
Example 5:
213-189\ \Rightarrow\ 200-200\ =\ 0213−189 ⇒ 200−200 = 0
Example 6:
9,853+9,999\ \Rightarrow\ 10,000+10,000\ =\ 20,0009,853+9,999 ⇒ 10,000+10,000 = 20,000
Example 7:
5,703+5,431\Rightarrow\ 6,000+5,000\ =\ 11,0005,703+5,431⇒ 6,000+5,000 = 11,000
Example 8:
6,423-3,610\ \Rightarrow\ 6,000-4,000\ =\ 2,0006,423−3,610 ⇒ 6,000−4,000 = 2,000
Example 9:
2,876+9,559\ \Rightarrow\ 3,000+10,000\ =\ 13,0002,876+9,559 ⇒ 3,000+10,000 = 13,000
Example 10:
4,639-2,990\ \Rightarrow\ 5,000-3,000\ =\ 2,0004,639−2,990 ⇒ 5,000−3,000 = 2,000
Step-by-step explanation:
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