đĸ Numeracy and Mathematics
First Level
Primary 3
Primary 4
Addition within 100
Add two-digit numbers using place value.
Add the tens together and the ones together. 23 + 14: 20+10=30 and 3+4=7, so 37.
Break each number into tens and ones, add the tens and add the ones, then combine. This is adding by place value.
Columnar addition aligns digits by place value and sums each column, carrying when a column reaches 10. It relies on the distributive property: (20+3)+(10+4) = (20+10)+(3+4).
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34 + 25 = ?
Answer: 59