NCERT Solutions for Class 4th Maths Chapter 7 Add Up — In-text Questions
Book page 101 Updated on2026-09-19
Q1.
Estimate the number of teachers going. ____
Answer
About 50 teachers.
24 teachers → about 20 28 teachers → about 30 20 + 30 = about 50
Why it happens: We change each number to the nearest ten first, because tens are easy to add in the head.
Tip: An estimate is not the exact answer. It only tells us roughly what to expect, so a silly mistake is easy to spot.
Q2.
24 teachers and 438 children are going from their school. 476 children from a neighbourhood school along with 28 teachers are also going to the same village. How many teachers are accompanying the children?
Answer
52 teachers are going with the children.
Teachers = 24 + 28
The working, written in columns.
2 T + 4 O 2 T + 8 O = 4 T + 12 O 10 ones make 1 ten, so 12 O = 1 T + 2 O = 5 T + 2 O = 52
Why it happens: 4 and 8 make 12 ones. We cannot write 12 in the ones place, so we regroup 10 of them as 1 ten and carry it to the tens column.
Check it yourself: Our estimate was about 50, and 52 is very close to it.