Q1.
5. Subtract by aligning the numbers in columns in your notebook. a) 83 – 29
Answer The working, written in columns.
83 − 29 = 54
Why it happens: 3 ones cannot give 9 ones, so 1 ten is opened up as 10 ones and the ones become 13.
NCERT Solutions for Class 4th Maths Chapter 7 Question 5 — Let Us Solve
Book page 109 Updated on2026-09-19
Q2.
b) 345 – 123
Answer The working, written in columns.
345 − 123 = 222
Why it happens: Every column has enough to take away from, so nothing is regrouped.
Q3.
c) 763 – 437
Answer The working, written in columns.
763 − 437 = 326
Why it happens: Only the ones are short, so we regroup once: 1 ten becomes 10 ones.
Q4.
d) 803 – 350
Answer The working, written in columns.
803 − 350 = 453
Why it happens: 0 tens cannot give 5 tens, so 1 hundred is opened up as 10 tens.
Check it yourself: 350 + 453 = 803.
Q5.
e) 900 – 328
Answer The working, written in columns.
900 − 328 = 572
Why it happens: 900 has no tens and no ones, so we regroup twice: 1 hundred becomes 10 tens, then 1 ten becomes 10 ones.