Olibits / Math / Addition & Subtraction
Primary 1 Math: Addition & Subtraction Practice
Real Primary 1 Math questions on Addition & Subtraction, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
MOE strand: Number and Algebra
Curriculum alignment
Mathematics Syllabus, Primary One to Six (MOE, 2021 syllabus)
Taught across P1–P6.
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Real Addition & Subtraction practice questions
Which number sentence does NOT equal 50?
82 − 32
76 − 26
68 − 19 ✓
95 − 45
82 − 32 = 50, 76 − 26 = 50, and 95 − 45 = 50, but 68 − 19 = 49, so it does not equal 50.
Priya solves 52 − 27 like this: 'The ones digit 7 is bigger than 2, so I'll just do 7 − 2 = 5. Then for the tens, 5 − 2 = 3. My answer is 35.' What is the correct answer, and what did Priya do wrong?
25 - she needed to regroup (borrow) a ten from 52 before subtracting, not swap the order of 7 and 2 ✓
35 - her method was correct
45 - she should have subtracted 5 − 2 first
20 - she forgot the ones place entirely
52 − 27 = 25. Since 7 is bigger than the ones digit 2, Priya needed to regroup a ten from the tens place (making it 4 tens 12 ones), not swap the subtraction order to 7 − 2.