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NCERT Solutions for Class 4th Maths Chapter 7 Practice: add and subtract — Let Us Do

Book page 114 Updated on2026-09-19

Q1.
1. Add. a) 23 + 489
Answer

23 + 489 = 512

HTO1123489+512
The working, written in columns.
Q2.
b) 105 + 295
Answer

105 + 295 = 400

HTO11105295+400
The working, written in columns.
Why it happens: The ones make 10 and then the tens make 10 as well, so the answer ends in two zeros.
Q3.
c) 630 + 56
Answer

630 + 56 = 686

HTO63056+686
The working, written in columns.
Q4.
d) 35 + 99
Answer

35 + 99 = 134

HTO113599+134
The working, written in columns.
Tip: A quicker way: 35 + 100 = 135, and 1 less than 135 is 134.
Q5.
e) 409 + 387
Answer

409 + 387 = 796

HTO1409387+796
The working, written in columns.
Q6.
f) 67 + 76
Answer

67 + 76 = 143

HTO116776+143
The working, written in columns.
Q7.
g) 580 + 207
Answer

580 + 207 = 787

HTO580207+787
The working, written in columns.
Q8.
h) 333 + 666
Answer

333 + 666 = 999

HTO333666+999
The working, written in columns.
Why it happens: Every column adds to 9, so no regrouping is needed anywhere.
Q9.
i) 826 + 268
Answer

826 + 268 = 1094

ThHTO11826268+1094
The working, written in columns.
Why it happens: 8 hundreds, 2 hundreds and 1 carried hundred make 11 hundreds, which is 1 thousand and 1 hundred.
Q10.
2. Subtract. a) 300 – 45
Answer

300 − 45 = 255

HTO291030045−255
The working, written in columns.
Why it happens: 300 has no tens and no ones, so we regroup twice before we can take anything away.
Q11.
b) 962 – 268
Answer

962 − 268 = 694

HTO81512962268−694
The working, written in columns.
Q12.
c) 706 – 209
Answer

706 − 209 = 497

HTO6916706209−497
The working, written in columns.
Q13.
d) 842 – 387
Answer

842 − 387 = 455

HTO71312842387−455
The working, written in columns.
Q14.
e) 674 – 76
Answer

674 − 76 = 598

HTO5161467476−598
The working, written in columns.
Tip: 76 has no hundreds. Line up 6 under 4 and 7 under 7.
Q15.
f) 754 – 409
Answer

754 − 409 = 345

HTO414754409−345
The working, written in columns.
Q16.
g) 403 – 245
Answer

403 − 245 = 158

HTO3913403245−158
The working, written in columns.
Q17.
h) 600 – 384
Answer

600 − 384 = 216

HTO5910600384−216
The working, written in columns.
Q18.
i) 546 – 538
Answer

546 − 538 = 8

HTO316546538−8
The working, written in columns.
Why it happens: The two numbers are very close, so the answer is a single digit — just 8.
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