Learn subjects / Grade 2 / Mathematics GRADE 2 · Mathematics · LEARNING COMPANION
Decoration for Festival Three guided lessons with explanations, visual steps, practice and a final check. An adult can read instructions aloud and help record the reflection.
Original chapter companion covering two-digit addition and subtraction using place value and regrouping. It does not reproduce or solve every textbook exercise. An adult should read prompts aloud and support handling small objects safely.
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01 · Get ready 02 · Learn 03 · Practise 04 · Final check 05 · My learning You can revisit any stage. Opening a page does not count as passing. Read all lesson explanations Read all lessons These explanations remain available without JavaScript. The separate learner and solution pages can be printed on A4.
LESSON 1
Add tens and ones Add two two-digit numbers without regrouping.
A ten is ten ones. Align tens with tens and ones with ones.
Split each number 24 is 20 + 4. 13 is 10 + 3.
Add the tens 20 + 10 = 30.
Add the ones 4 + 3 = 7.
Join the parts 30 + 7 = 37, so 24 + 13 = 37.
Worked example: 32 + 25 = (30 + 20) + (2 + 5) = 50 + 7 = 57. Check: adding 25 must make 32 larger.
Watch for this: Do not add a tens digit to a ones digit. They name different-sized groups.
Discuss: Make an addition story about 21 red paper flags and 16 blue flags. Find the total.
LESSON 2
Regroup ten ones Exchange ten ones for one ten when adding.
Ten loose ones can be grouped as one ten without changing the total.
Add the parts For 27 + 15, add 20 + 10 = 30 and 7 + 5 = 12.
Find ten in the ones Twelve ones can be separated into ten ones and two ones.
Make a new ten Exchange ten ones for one ten. Now there are 4 tens and 2 ones.
Write and check 40 + 2 = 42. Check by making ten: 27 + 3 + 12 = 42.
Worked example: 36 + 18: 30 + 10 = 40; 6 + 8 = 14. Exchange ten of those ones. We have 50 + 4 = 54.
Watch for this: Regrouping does not create extra objects. Ten ones and one ten are the same amount.
Discuss: Explain with a drawing why 28 + 14 gives 42, not 312.
LESSON 3
Exchange a ten to subtract Subtract a two-digit number and check by addition.
Subtraction finds what remains or the difference. Exchange a ten when there are too few loose ones.
Look at the ones For 42 - 17, two loose ones are not enough to remove seven.
Exchange one ten 42 is 4 tens and 2 ones. Exchange one ten to make 3 tens and 12 ones.
Subtract each part 12 ones - 7 ones = 5 ones. 3 tens - 1 ten = 2 tens.
Check the result The answer is 25. Check: 25 + 17 = 42.
Worked example: 53 - 26: exchange one ten to show 4 tens and 13 ones. 13 - 6 = 7 and 4 tens - 2 tens = 2 tens. Answer 27. Check 27 + 26 = 53.
Watch for this: You cannot swap the subtraction just to make it easy: 2 - 7 is not 7 - 2. Regroup the whole number instead.
Discuss: A group makes 61 paper flowers and uses 24. Show how to find and check how many remain.
Continue on paper Sources and coverage Original chapter companion covering two-digit addition and subtraction using place value and regrouping. It does not reproduce or solve every textbook exercise. An adult should read prompts aloud and support handling small objects safely.
Original HelioLearn teaching and questions. Source-aligned companion; not an official NCERT/CBSE publication or full textbook solution bank. Independent teacher review and narrated video are pending.
