We will learn how to add 3-digit numbers with regrouping. Add 495 and 65.

Solution:

Step 1: arrange the numbers vertically.

Step 2: add the. 5 + 5 = 10 ones = 1 ten and 0 ones. Write 0 in the units column and carry over 1 to the ten column.

Step 3: add the tens. 9 + 6 + 1
(transferred) = 16 tens = 1 hundred and 6 tens. Write 6 in the column of ten and transfer it 1 to the hundred column.

Step 4: add the hundreds. 4 +1
(transferred) = 5 hundred. Write 5 in the hundred column.

So 495 + 65 = 560

379 and 558 add 5

Solution:

Step 1: arrange the numbers vertically.

Step 2: add the ones column. 9 + 8 = 17 ones = 1 tens and 7 ones. Put 7 in the units column and transfer 1
to the ten column.

Step 3: add the tens column. 7 + 5 + 1 (transferred) = 13 tens = 1 hundred and 3 tens. Write 3 in the column of ten and transfer it 1 to the hundred column.

Step 4: add the hundreds column. 3 + 5 + 1 (transferred) = 9 hundred.

So 379 + 558 = 937

Questions and answers on adding 3-digit numbers with regrouping:

I. Add the following numbers:

(i) 973 + 18

(ii) 536 + 69

(iii) 797 + 26

(iv) 479 + 32

(v) 284 + 33

(vi) 529 + 74

(vii) 664 + 9

(viii) 708 + 12

(ix) 675 + 38

(x) 468 + 68

(xi) 209 + 84

(xii) 900 + 92

(xiii) 421 + 79

(xiv) 579 + 78

(xv) 251 + 84

(xvi) 676 + 35

II. Add the following numbers:

(i) 257 + 483

(ii) 559 + 207

(iii) 357 + 376

(iv) 436 + 354

(v) 618 + 162

(vi) 428 + 357

(vii) 364 + 546

(viii) 518 + 293

(ix) 329 + 600

(x) 533 + 428

(xi) 442 + 279

(xii) 269 + 542

(xiii) 364 + 263

(xiv) 490 + 240

(xv) 836 + 157

(xvi) 680 + 255

3rd grade math class

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