📗 Unit 3: Subtraction — Textbook Answers (Class 3 Maths Magic)
Page 70 — Magic Trick (Hidden Seeds Table)
Hidden seeds = Total seeds − Seeds on the table
| Total Seeds | Seeds on Table | Hidden Seeds |
|---|---|---|
| 20 | 12 | 8 |
| 20 | 10 | 10 |
| 20 | 8 | 12 |
| 22 | 12 | 10 |
| 25 | 14 | 11 |
| 29 | 17 | 12 |
Page 73 — Do These (Subtraction of 3-digit number from 3-digit number)
a) 236 − 5 = 231
b) 327 − 4 = 323
c) 478 − 7 = 471
d) 569 − 6 = 563
Page 76 — Do These
1. The cost of a shirt is ₹885. The price is reduced by ₹35 for a festive season. What is the price of the shirt after reduction?
Cost of the shirt = ₹885
Reduced amount = ₹35
Current price = 885 − 35 = ₹850
2. Ramya wanted to buy a new dress for the festival worth ₹750. But she had saved ₹550 in her piggy bank. How much more money does she need?
Cost of dress = ₹750
Amount saved = ₹550
More money needed = 750 − 550 = ₹200
Exercise – 1 (Page 76)
1. Do the following.
a) 356 − 4 = 352
b) 478 − 2 = 476
c) 583 − 2 = 581
d) 876 − 423 = 453
e) 745 − 132 = 613
f) 267 − 133 = 134
g) 478 − 114 = 364
h) 679 − 431 = 248
2. Answer the following questions.
a) What is the difference between 300 and 200?
Larger number = 300
Smaller number = 200
Difference = 300 − 200 = 100
b) What will we get, if we subtract 125 from 175?
Given number = 175
Number to subtract = 125
Result = 175 − 125 = 50
3. How much more to be added to make ₹425 equal to ₹679?
Amount required = ₹679
Amount available = ₹425
Amount to be added = 679 − 425 = ₹254
4. There are 385 students in a school. The Mid Day Meal agency has 142 eggs with them. How many more eggs are required to get each child an egg?
Total students = 385
Eggs available = 142
More eggs required = 385 − 142 = 243 eggs
5. Sonu had ₹50. He went to a book shop to buy a notebook that cost ₹75. How much more money does he need? ( )
Cost of notebook = ₹75
Money Sonu has = ₹50
More money needed = 75 − 50 = ₹25
Answer: c) ₹25
Page 78–80 — Subtraction of 2-digit number from 3-digit number (with regrouping)
Danayya has ₹337. He ate one masala dosa and paid ₹48. Balance amount = 337 − 48 = ₹289
Example: If cost of dosa is ₹69, balance = 337 − 69 = ₹268
Do these:
1. a) 425 − 37 = 388
b) 546 − 69 = 477
c) 635 − 77 = 558
2. Rajaiah has 342 sheep. He sold 65 sheep. How many sheep are there now?
Total sheep = 342
Sheep sold = 65
Sheep remaining = 342 − 65 = 277 sheep
Page 80–84 — Subtraction of 3-digit number from 3-digit number (with regrouping)
Cost of medicine in private medical shop = ₹425; in Generic medical shop = ₹156.
Price in private shop = ₹425
Price in Generic shop = ₹156
Money saved = 425 − 156 = ₹269
Example: A villager donated 125 blankets last year and 270 blankets this year.
Blankets distributed this year = 270
Blankets distributed last year = 125
More blankets distributed this year = 270 − 125 = 145 blankets
Page 86 — Do These
1. Help the monkey to get the bananas — subtract 192 from the number on the step and continue.
Start = 770
770 − 192 = 578
578 − 192 = 386
386 − 192 = 194 (Bananas reached!)
2. If 235 hens are sold from 520 hens in a poultry, how many hens will remain?
Total hens = 520
Hens sold = 235
Hens remaining = 520 − 235 = 285 hens
3. There are 432 students in a school. If 245 members are girls, how many boys are there?
Total students = 432
Number of girls = 245
Number of boys = 432 − 245 = 187 boys
4. One pair of chappal costs ₹250. If Raju has ₹195 with him, how much more amount is required?
Cost of chappal = ₹250
Amount Raju has = ₹195
More amount required = 250 − 195 = ₹55
Page 88 — Do These (Subtraction by Estimation)
Estimate the difference and circle the answer:
a) 520 − 180: 520 is nearer to 500, 180 is nearer to 200 → 500 − 200 = 300
b) 685 − 210: 685 is nearer to 700, 210 is nearer to 200 → 700 − 200 = 500
Exercise – 2 (Page 92) APTEACHERS.IN
1. Match the following.
200 − 112 = 88
415 − 197 = 218
642 − 327 = 315
941 − 149 = 792
960 − 177 = 783
2. Fill the missing digits in the following subtractions to correct it.
a) 80 − 45 = 35
b) 93 − 58 = 35
c) 567 − 198 = 369
3. Ramya is a guava seller. In the morning she had 500 guavas in the basket. In the evening she had 295 guavas. How many guavas did Ramya sell?
Guavas in the morning = 500
Guavas in the evening = 295
Guavas sold = 500 − 295 = 205 guavas
4. There are 650 chikkies in a school. 579 chikkies were served in lunch. How many chikkies will remain?
Total chikkies = 650
Chikkies served = 579
Chikkies remaining = 650 − 579 = 71 chikkies
5. I have some money. If you give ₹200 to me, my money will become ₹780. How much money do I have already?
Money after receiving = ₹780
Money received = ₹200
Money already had = 780 − 200 = ₹580
6. Naresh has ₹500 with him. Which of the following items can he buy?
Shirt = ₹200, Pant = ₹300, Shoe = ₹400, Bag = ₹300, Ball = ₹200, Water bottle = ₹100, Bat = ₹400
Money Naresh has = ₹500
Since every item costs ₹500 or less, Naresh can buy any one of these items (Shirt, Pant, Shoe, Bag, Ball, Water bottle, or Bat) individually with his ₹500.
7. Observe the 4 number cards: Card A = 22, Card B = 24, Card C = 32, Card D = 42. Radha picked two cards. The difference between them is 20. Which cards did she pick? ( )
Card D − Card A = 42 − 22 = 20
Answer: d) A and D
Improve Your Learning (Page 94)
1. Find the number that should be written in the box: 90 − ▢ = 78 ( )
Given number = 90
Result = 78
Missing number = 90 − 78 = 12
Answer: b) 12
2. Write two subtraction sentences from these numbers: 15, 7, 8
a) 15 − 7 = 8
b) 15 − 8 = 7
3. Swapna is selling red and yellow flowers at a fair. She has 278 flowers.
i) If 45 of the flowers are yellow, how many are red?
Total flowers = 278
Yellow flowers = 45
Red flowers = 278 − 45 = 233 flowers
ii) 129 flowers were left with Swapna by the end of the day. How many flowers did she sell?
Total flowers = 278
Flowers left = 129
Flowers sold = 278 − 129 = 149 flowers
4. Look at the 4 cards shown: Card A = 22, Card B = 24, Card C = 32, Card D = 42. Radha picked two cards with a difference of 20. Which cards did she pick? ( )
Card D − Card A = 42 − 22 = 20
Answer: d) A and D
5. If a guava seller started with some fruit, sold 149, and has 251 left, he claims he started with 400. Verify it using subtraction.
Fruits sold = 149
Fruits left = 251
Total fruits started with = 149 + 251 = 400
Since 400 = 400, the seller's claim is correct.
6. Use the numbers 112, 132, 155, 175, 195 and create three different pairs that result in a difference of exactly 20. Then, create one pair where the difference is exactly 43.
Pairs with difference 20:
132 − 112 = 20
175 − 155 = 20
195 − 175 = 20
Pair with difference 43:
155 − 112 = 43
