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NCERT Solutions for Class 4th Maths Chapter 13 Times-10 / Constructing Tables — In-text Questions

Book page 185 Updated on2026-09-19

Q1.
What is 10 × 10 = ____ Tens = _______
Answer
Ten strips of ten pushed together make one hundred-square.
10 × 10 = 10 Tens
10 Tens = 100 (1 Hundred)
Why it happens: Ten tens fill a full square of a hundred. That is why we give it a new name — one hundred.
Q2.
How many pebbles are there in this arrangement? _______
15
The pebble arrangement printed on page 185 — 5 rows of 15 pebbles.
Answer
105
The pebble arrangement: 5 rows with 15 pebbles in each row, split into 10 and 5.
The arrangement is 5 × 15.
Split each row into 10 and 5.
5 × 10 = 50
5 × 5 = 25
50 + 25 = 75 pebbles
Why it happens: Splitting 15 into 10 and 5 lets us use two easy tables instead of one hard one.
Q3.
5 × 15 = 5 × 10 and 5 × 5 = ______ + ______ = ______
105
The pebble arrangement: 5 rows with 15 pebbles in each row, split into 10 and 5.
Answer
105
The pebble arrangement: 5 rows with 15 pebbles in each row, split into 10 and 5.
5 × 10 = 50
5 × 5 = 25
50 + 25 = 75
So 5 × 15 = 75
Why it happens: The two dashed blocks together are the whole arrangement, so their counts add up to the total.
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