Worksheet on Adding 3-Digit Numbers

Practice the questions given in the worksheet on adding 3-digit numbers. The questions are based on adding 3-digit problems that do not require regrouping (no regrouping) where 3 addends are needed to arrange in a vertical order to add easily.

We first arrange them one below the other in place value columns and then regroup 10 ones to one ten, 10 tens to 1 hundred, if required.

Now, answer the following questions to quickly recap what you have learnt about addition.

I. Add the following:

(i) 320 + 200 = _____

(ii) 515 + 230 = _____

(iii) 700 + 150 = _____

(iv) 180 + 20 = _____

(v) 260 + 40 = _____

(vi) 650 + 250 = _____

(vii) 789 + 11 = _____

(viii) 231 + 119 = _____

II. Add the following numbers (three-digit numbers):

(i) 485 + 513 = _____

(ii) 586 + 301 = _____

(iii) 845 + 132 = _____

(iv) 452 + 523 = _____

(v) 356 + 621 = _____

(vi) 735 + 213 = _____

(vii) 642 + 254 = _____

(viii) 316 + 462 = _____

(ix) 560 + 316 = _____

(x) 361 + 417 = _____

(xi) 654 + 211 = _____

(xii) 506 + 273 = _____

(xii) 361 + 628 = _____

(xiv) 253 + 422 = _____

(xv) 523 + 363 = _____

(xvi) 717 + 252 = _____

(xvii) 512 + 234 = _____

(xix) 294 + 504 = _____

(xx) 284 + 305 = _____

(xxi) 745 +232 = _____

(xxii) 281 + 716 = _____

(xxiii) 812 + 103 = _____

(xxiv) 815 + 082 = _____

(xxv) 472 + 316 = _____

(xxvi) 524 + 352 = _____

(xxvii) 218 + 700 = _____

(xxviii) 531 + 444 = _____

(xxix) 145 + 834 = _____

(xxx) 100 + 304 = _____

(xxxi) 781 + 114 = _____

(xxxii) 623 + 313 = _____

(xxxiii) 300 + 300 = _____

(xxxiv) 513 + 324 = _____

III. Arrange in columns and add:

(i) 302; 315; 50

(ii) 612; 201; 122

(iii) 451; 222; 310

(iv) 302; 120; 400

IV. Fill in the blanks, using properties of addition:

(i) 528 + 600 + 318 = ……….. + 600 + 528

(ii) 429 + ……….. = 429

(iii) 199 + ……….. = 162 + 199

V. Estimate the sum to the nearest ten:

(i) 455 + 312 = _____

(ii) 218 + 607 = _____

(iii) 506 + 189 = _____

(iv) 781 + 21 = _____

VI. Addition of 3-Digit Numbers without Regrouping:

(i)

H T O

9 1 0

+ 8 5

___________

(ii)

H T O

8 1 1

+ 1 2 1

___________

(iii)

H T O

2 7 0

+ 4 2 6

___________

(iv)

H T O

3 4 6

+ 4 1 3

___________

(v)

H T O

1 1 1

+ 3 4 5

___________

(vi)

H T O

3 0

+ 6 5 8

___________

(vii)

H T O

1 2 4

+ 7 7 0

___________

(viii)

H T O

4 4 1

+ 2 1 8

___________

(ix)

H T O

2 3 6

+ 3 1 1

___________

(x)

H T O

1 0 5

+ 5 0 1

___________

VII. Add the following 3-Digit Numbers without Regrouping as shown:

(i)

H T O

1 2 8

+ 4 1

1 6 9 ____________

(ii)

H T O

3 4 1

+ 4 7

____________

(iii)

H T O

5 6 1

+ 3 5

____________

(iv)

H T O

2 4 3

+ 7 5 4

___________

(v)

H T O

5 9 1

+ 4 0 2

___________

(vi)

H T O

4 5 2

+ 2 2 1

___________

(vii)

H T O

5 0 6

+ 4 2 1

___________

(viii)

H T O

6 0 7

+ 1 1 1

___________

(ix)

H T O

8 0 5

+ 1 6 1

___________

(x)

H T O

5 1 4

+ 4 0 3

___________

(xi)

H T O

4 0 2

+ 2 0 4

___________

(xii)

H T O

3 5 4

+ 2 3 3

___________

VIII. Addition of 3-Digit Numbers with Regrouping:

(i)

H T O

1 5 5

+ 1 7 7

___________

(ii)

H T O

1 7 8

+ 6 2 4

___________

(iii)

H T O

2 1 7

+ 4 6 9

___________

(iv)

H T O

4 4 4

+ 2 2 9

___________

(v)

H T O

2 2 3

+ 3 7

___________

(vi)

H T O

4 2 9

+ 1 4 3

___________

(vii)

H T O

2 7 8

+ 1 2 9

___________

(viii)

H T O

1 5 6

+ 3 6 7

___________

(ix)

H T O

4 0 2

+ 1 6 9

___________

(x)

H T O

1 4 9

+ 3 1 6

___________

IX. Addition of Two 3-Digit Numbers with Regrouping as shown:

(i)

H T O

6 6 2

+ 1 9

6 8 1 ____________

(ii)

H T O

2 2 9

+ 3 4

____________

(iii)

H T O

5 4 3

+ 3 7

____________

(iv)

H T O

6 3 2

+ 1 2 8

___________

(v)

H T O

4 3 7

+ 2 2 8

___________

(vi)

H T O

3 2 7

+ 3 4 6

___________

(vii)

H T O

4 5 1

+ 1 6 4

___________

(viii)

H T O

1 6 3

+ 2 9 3

___________

(ix)

H T O

4 6 4

+ 2 5 5

___________

(x)

H T O

5 9 6

+ 2 6 3

___________

(xi)

H T O

2 4 5

+ 1 7 2

___________

(xii)

H T O

3 5 3

+ 3 9 2

___________

(xiii)

H T O

1 4 9

+ 5 0 6

___________

(xiv)

H T O

4 6 5

+ 3 2 9

___________

(xv)

H T O

6 3 7

+ 2 1 4

___________

(xvi)

H T O

7 4 5

+ 1 6 3

___________

(xvii)

H T O

7 6 3

+ 1 5 1

___________

(xviii)

H T O

1 4 5

+ 1 8 2

___________

Answers for the worksheet on adding three digit numbers are given below to check the exact answers of the above questions to add the 3-digit numbers that do not require regrouping.

Answers:

I. (i) 520

(ii) 745

(iii) 7850

(iv) 200

(v) 300

(vi) 900

(vii) 800

(viii) 350

II. (i) 998

(ii) 887

(iii) 977

(iv) 975

(v) 977

(vi) 948

(vii) 896

(viii) 778

(ix) 876

(x) 778

(xi) 865

(xii) 779

(xii) 989

(xiv) 675

(xv) 886

(xvi) 969

(xvii) 746

(xix) 798

(xx) 589

(xxi) 977

(xxii) 997

(xxiii) 915

(xxiv) 897

(xxv) 788

(xxvi) 876

(xxvii) 918

(xxviii) 975

(xxix) 979

(xxx) 404

(xxxi) 895

(xxxii) 936

(xxxiii) 600

(xxxiv) 837

III. (i) 667

(ii) 935

(iii) 983

(iv) 822

IV. (i) 318

(ii) 0

(iii) 162

$Worksheet on Addition of 3-digit Numbers$

V. (i) 770

(ii) 830

(iii) 700

(iv) 800

VI. (i) 995

(ii) 932

(iii) 696

(iv) 759

(v) 456

(vi) 688

(vii) 894

(viii) 659

(ix) 547

(x) 606

VII. (ii) 388

(iii) 596

(iv) 997

(v) 993

(vi) 673

(vii) 927

(viii) 718

(ix) 966

(x) 917

(xi) 606

(xii) 587

VIII. (i) 332

(ii) 802

(iii) 686

(iv) 673

(v) 260

(vi) 572

(vii) 407

(viii) 523

(ix) 571

(x) 465

IX. (ii) 263

(iii) 580

(iv) 760

(v) 665

(vi) 673

(vii) 615

(viii) 456

(ix) 719

(x) 859

(xi) 417

(xii) 745

(xiii) 655

(xiv) 794

(xv) 851

(xvi) 908

(xvii) 914

(xviii) 327

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