Ncert solutions

Ncert solutions

Grade 6

Knowing Our Numbers | Exercise 1.3

Question 1

Q1) Estimate each of the following using general rule:

(a) 730 + 998 (b) 796 – 314 (c) 12,904 +2,888 (d) 28,292 – 21,496

Make ten more such examples of addition, subtraction and estimation of their outcome.

Solution 1:

(a) 730+998

Rounding of to nearest hundred

730\Rightarrow700 and 998\Rightarrow1,000

730+998\ \Rightarrow\ 700+1,000

= 1,700

(b) 796-314

Rounding of to nearest hundered

796\Rightarrow800\ \ and\ \ 314\Rightarrow300

796-314\ \Rightarrow\ 800-300

= 500

(c) 12,904+2,888

Rounding off to nearest thousand

12,904\Rightarrow13,000\ \ and\ \ 2,888\Rightarrow3,000\ 12,904+2,888\ \Rightarrow\ 13,000+3,000

= 16,000

(d) 28,292-21,496

Rounding off to nearest thousand

28,292\Rightarrow28,000\ \ and\ \ 21,496\Rightarrow21,000

28,292-21,496\ \Rightarrow\ 28,000-21,000

= 7,000

10 more examples :-

Example 1:

1,246+5,822\ \Rightarrow\ 1,200+6,000\ =\ 7,200

Example 2:

333+737\ \Rightarrow\ 300+700\ =\ 1,000

Example 3:

23,489-13,503\ \Rightarrow\ 23,000-14,000\ =\ 9,000

Example 4:

11,307-10,312\Rightarrow\ 11,000-10,000\ =\ 1,000

Example 5:

213-189\ \Rightarrow\ 200-200\ =\ 0

Example 6:

9,853+9,999\ \Rightarrow\ 10,000+10,000\ =\ 20,000

Example 7:

5,703+5,431\Rightarrow\ 6,000+5,000\ =\ 11,000

Example 8:

6,423-3,610\ \Rightarrow\ 6,000-4,000\ =\ 2,000

Example 9:

2,876+9,559\ \Rightarrow\ 3,000+10,000\ =\ 13,000

Example 10:

4,639-2,990\ \Rightarrow\ 5,000-3,000\ =\ 2,000

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subject-cta

Question 1

Q1) Estimate each of the following using general rule:

(a) 730 + 998 (b) 796 – 314 (c) 12,904 +2,888 (d) 28,292 – 21,496

Make ten more such examples of addition, subtraction and estimation of their outcome.

Solution 1:

(a) 730+998

Rounding of to nearest hundred

730\Rightarrow700 and 998\Rightarrow1,000

730+998\ \Rightarrow\ 700+1,000

= 1,700

(b) 796-314

Rounding of to nearest hundered

796\Rightarrow800\ \ and\ \ 314\Rightarrow300

796-314\ \Rightarrow\ 800-300

= 500

(c) 12,904+2,888

Rounding off to nearest thousand

12,904\Rightarrow13,000\ \ and\ \ 2,888\Rightarrow3,000\ 12,904+2,888\ \Rightarrow\ 13,000+3,000

= 16,000

(d) 28,292-21,496

Rounding off to nearest thousand

28,292\Rightarrow28,000\ \ and\ \ 21,496\Rightarrow21,000

28,292-21,496\ \Rightarrow\ 28,000-21,000

= 7,000

10 more examples :-

Example 1:

1,246+5,822\ \Rightarrow\ 1,200+6,000\ =\ 7,200

Example 2:

333+737\ \Rightarrow\ 300+700\ =\ 1,000

Example 3:

23,489-13,503\ \Rightarrow\ 23,000-14,000\ =\ 9,000

Example 4:

11,307-10,312\Rightarrow\ 11,000-10,000\ =\ 1,000

Example 5:

213-189\ \Rightarrow\ 200-200\ =\ 0

Example 6:

9,853+9,999\ \Rightarrow\ 10,000+10,000\ =\ 20,000

Example 7:

5,703+5,431\Rightarrow\ 6,000+5,000\ =\ 11,000

Example 8:

6,423-3,610\ \Rightarrow\ 6,000-4,000\ =\ 2,000

Example 9:

2,876+9,559\ \Rightarrow\ 3,000+10,000\ =\ 13,000

Example 10:

4,639-2,990\ \Rightarrow\ 5,000-3,000\ =\ 2,000

Still have questions? Our expert teachers can help you out

Book a free class now

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Learn from an expert tutor.

Book a free class now
subject-cta
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