Skip to content
KidosLab

Grade 4 Adding in Your Head Worksheets

Add two numbers without writing anything down, first without carrying and then with.

Every sheet below is generated fresh with a matching answer key. Pick one of the three levels, preview it, and print or download the PDF — no account, no watermark. For the other grade 4 mental maths skills, see all mental maths worksheets.

Build your worksheet

Mental Maths · Grade 4

Grade
Topic
SkillEach skill is a different kind of question, with its own levels.
Level
Questions
30

The link is the save: it reopens this exact worksheet — same questions, same settings. Bookmark it or send it on. No account needed.

Live preview

Grade 4 · 2 pages · A4

Mental Maths Practice

Grade 4 • Adding in Your Head • Sums that carry
Name:Date:

Answer as fast as you can, in your head. No calculator.

  1. 1) 303 + 459 =
  2. 2) 516 + 214 =
  3. 3) 511 + 329 =
  1. 4) 501 + 349 =
  2. 5) 678 + 117 =
  3. 6) 641 + 139 =
  1. 7) 459 + 419 =
  2. 8) 324 + 566 =
  3. 9) 506 + 304 =
  1. 10) 156 + 324 =
  2. 11) 306 + 139 =
  3. 12) 615 + 109 =
  1. 13) 221 + 459 =
  2. 14) 481 + 309 =
  3. 15) 413 + 208 =
  1. 16) 558 + 124 =
  2. 17) 169 + 515 =
  3. 18) 287 + 409 =
  1. 19) 563 + 209 =
  2. 20) 429 + 216 =
  3. 21) 322 + 349 =
  1. 22) 102 + 609 =
  2. 23) 748 + 102 =
  3. 24) 371 + 509 =
  1. 25) 568 + 329 =
  2. 26) 411 + 109 =
  3. 27) 552 + 209 =
  1. 28) 433 + 259 =
  2. 29) 778 + 118 =
  3. 30) 271 + 219 =
Finished already?Get more worksheets for free at www.kidoslab.com
Page 1 of 2

Answer Key

  1. 1. 762
  2. 2. 730
  3. 3. 840
  4. 4. 850
  1. 5. 795
  2. 6. 780
  3. 7. 878
  4. 8. 890
  1. 9. 810
  2. 10. 480
  3. 11. 445
  4. 12. 724
  1. 13. 680
  2. 14. 790
  3. 15. 621
  4. 16. 682
  1. 17. 684
  2. 18. 696
  3. 19. 772
  4. 20. 645
  1. 21. 671
  2. 22. 711
  3. 23. 850
  4. 24. 880
  1. 25. 897
  2. 26. 520
  3. 27. 761
  4. 28. 692
  1. 29. 896
  2. 30. 490
Finished already?Get more worksheets for free at www.kidoslab.com
Page 2 of 2

What each level generates

Grade 4 adding in your head — the exact skill behind each difficulty setting, straight from the generator.

  1. Level 1Sums with no carrying
  2. Level 2Sums that carry
  3. Level 3Add three numbers

Grade levels follow the progression common to most English-language curricula — not one specific national curriculum. Every level shows exactly what it generates, so you can check the fit with your own program. See the full scope & sequence →

More Grade 4 mental maths skills

Each one generates a different kind of question, with its own three levels and answer key.

Frequently asked questions

▸What mental maths should a Grade 4 student know?

All four operations: multiplication and division facts to 12, addition and subtraction of two- and three-digit numbers, and scaling facts by 10 and 100 — for example 47 × 10 or 800 ÷ 100. Seven separate skills cover them here, and Mixed Chains is the one that puts more than one operation on a line.

▸Do any of the divisions leave a remainder?

Only on one level. The middle level of Division Facts is built from a quotient and a remainder and answers like 7 R 5. Everywhere else the dividend is built by multiplying the answer by the divisor, so the result is an exact whole number and the focus stays on recall speed.

▸What does the Multiply by 10 and 100 skill cover?

Shifting the digits: level 1 multiplies by ten, level 2 by a hundred, and level 3 divides by both — 47 × 10, 47 × 100, 470 ÷ 10, 800 ÷ 100. It drills the place-value scaling habit that turns a known fact into a bigger one without extra work.

▸How do I reuse the same worksheet later?

The link in your address bar encodes the skill, level, count and shuffle, so opening it again rebuilds the identical sheet and the identical answer key. Bookmark it for a fair re-test, or press Shuffle for a fresh set at the same skill and level.