NCERT Solutions for Class 4th Maths Chapter 4 The place value slider — Let Us Play
Book page 54 Updated on2026-09-19
Q1. Make the place value slider. Children can take turns to increase or decrease the number as told. — a) 1895—increase the number by 1
Answer 1895 + 1 = 1896
Only the Ones strip of the slider needs to move.
Why it happens: adding or taking away a whole ten, hundred or one moves only that one strip — unless that strip runs past 9 or below 0.
Q2. Make the place value slider. Children can take turns to increase or decrease the number as told. — b) 2785—increase the number by 10
Answer 2785 + 10 = 2795
Only the Tens strip of the slider needs to move.
Why it happens: adding or taking away a whole ten, hundred or one moves only that one strip — unless that strip runs past 9 or below 0.
Q3. Make the place value slider. Children can take turns to increase or decrease the number as told. — c) 3369—decrease the number by 2
Answer 3369 – 2 = 3367
Only the Ones strip of the slider needs to move.
Why it happens: adding or taking away a whole ten, hundred or one moves only that one strip — unless that strip runs past 9 or below 0.
Q4. Make the place value slider. Children can take turns to increase or decrease the number as told. — d) 5648—decrease the number by 10
Answer 5648 – 10 = 5638
Only the Tens strip of the slider needs to move.
Why it happens: adding or taking away a whole ten, hundred or one moves only that one strip — unless that strip runs past 9 or below 0.
Q5. Make the place value slider. Children can take turns to increase or decrease the number as told. — e) 6487—increase the number by 20
Answer 6487 + 20 = 6507
Only the Tens strip of the slider needs to move.
Here the Tens digit is 8. Adding 2 tens makes 10 tens, which is 1 hundred. So the Hundreds digit goes up by 1 and the Tens digit becomes 0.
Why it happens: adding or taking away a whole ten, hundred or one moves only that one strip — unless that strip runs past 9 or below 0.
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