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NCERT Solutions for Class 5th Maths Chapter 8 Mary and Daisy's bottle, and converting litres and millilitres — Let Us Think

Book page 115 Updated on2026-09-19

Q1.
Mary and Daisy filled their bottle with 1 l 400 ml of water. They wondered about the capacity of the bottle in ml. How much is it? One says 1,400 ml and the other says “No, it is 1,040 ml.” Who do you think is correct and why?
Answer

The one who said 1,400 ml is correct. 1 l 400 ml = 1,400 ml. The answer 1,040 ml is wrong.

  1. Change the litre part. 1 l = 1,000 ml.
  2. Keep the ml part. 400 ml.
  3. Add. 1,000 ml + 400 ml = 1,400 ml.
1 l 400 ml = 1,000 + 400 = 1,400 ml

The wrong answer 1,040 ml would mean 1,000 + 40 = 1 l 40 ml
But the bottle holds 400 ml extra, not 40 ml
Why the mistake happened: The ml part must fill three places. Four hundred is written 4 0 0. Whoever answered 1,040 wrote 40 instead of 400 — they slipped one column and lost 360 ml, more than a glassful.
Use the boxes again: 1 l | 4 0 0 ml → 1,400 ml. 1 l | 0 4 0 ml → 1,040 ml. Three boxes, always.
Q2.
Convert and fill in the blanks appropriately. You can use the double number line given earlier. (a) 3 l 8 ml = _____ ml (b) 9 l 90 ml = _____ ml (c) 14,075 ml = ____ l ____ ml (d) 8 l 86 ml = ____ ml (e) 12,200 ml = ____ l _____ ml (f) 18,350 ml = ____ l ____ ml
1 l2 l6 l8 l____ l14 l____ l____ l1000 ml2000 ml____ ml____ ml12,000 ml____ ml20,000 ml25,000 ml
The double number line printed on page 114. The top line is in litres, the bottom line in millilitres.
Answer

(a) 3,008 ml   (b) 9,090 ml   (c) 14 l 75 ml   (d) 8,086 ml   (e) 12 l 200 ml   (f) 18 l 350 ml

Three of these go one way and three go the other way. Sort them first.

Litres and millilitres → millilitres (parts a, b, d): multiply the litres by 1,000 and add the ml, keeping three boxes for the ml.

Millilitres → litres and millilitres (parts c, e, f): count three digits from the right; those are the ml, and the rest are the litres.

PartWorkingAnswer
(a) 3 l 8 ml3,000 + 0083,008 ml
(b) 9 l 90 ml9,000 + 0909,090 ml
(c) 14,075 ml14 | 07514 l 75 ml
(d) 8 l 86 ml8,000 + 0868,086 ml
(e) 12,200 ml12 | 20012 l 200 ml
(f) 18,350 ml18 | 35018 l 350 ml
Look hard at (a). Only 8 millilitres — less than two teaspoons. In the three boxes it becomes 0 0 8, so the answer is 3,008 ml. Writing 3,800 ml would be a huge mistake, almost 800 ml too much.
Check them all: turn each answer back. 3,008 → 3 | 008 → 3 l 8 ml ✓   14 l 75 ml → 14,000 + 75 = 14,075 ✓
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