Grade 2 Mathematics Additions – Adding Numbers With Different Digit Numbers Notes

Mathematics — Additions

Subtopic: Adding Numbers With Different Digit Numbers (Age 7)

When we add numbers that have different numbers of digits (for example 23 + 5), we must line up the digits in columns by place value: ones under ones, tens under tens. This helps us add correctly.

Place Value Reminder

Simple Steps to Follow

1. Write the numbers in a column. Put ones under ones and tens under tens.
2. Start adding from the right (ones column).
3. If the ones add to 10 or more, write the ones digit and carry the tens to the next column.
4. Add the tens column (including any carry).
5. Write the final answer.

Example 1 — No carry

Steps: Line up 5 under the 3 (ones). 3 + 5 = 8. Tens: 2 + 0 = 2. Answer = 28.

Example 2 — With carry (regrouping)

Steps: Line up 8 under 7. Ones: 7 + 8 = 15. Write 5 in ones, carry 1 to tens. Tens: 4 + 0 + 1 = 5. Answer = 55.

Pictorial (Using tens rods and ones counters)

Practice Questions

1. Add: 14 + 6 = _____
2. Add: 32 + 9 = _____
3. Add: 5 + 27 = _____
4. Add: 49 + 7 = _____
5. Add: 68 + 5 = _____

Tips for Parents and Teachers (Kenya)

• Use objects like maize grains, pebbles or buttons to show ones and sticks for tens.
• Practice lining numbers in columns on a chalkboard or exercise book.
• Start with easy sums (one-digit + two-digit) before moving to three-digit sums.
• Praise the child for using the steps: line up, add ones, carry (if needed), then add tens.

Good work! Practice these steps and soon adding numbers with different digit numbers will be easy.