Brain Test 1 Level 15

Brain Test 1 Level 15 Question

4+5×5-2=?

Strategy Guide for Brain Test 1 Level 15

• 1.Remember PEMDAS/BODMAS: multiplication before addition/subtraction. So 5×5=25 first;
• 2.Calculate stepwise: 5×5=25, then 25-2=23, finally 4+23=27;
• 3.Break it down: handle multiplication (5×5=25), then subtraction (25-2=23), then addition (4+23=27).

Common Mistakes

• 1.Adding 4+5 first to get 9, then multiplying by 5, resulting in 45-2=43;
• 2.Calculating left to right: 4+5=9, 9×5=45, 45-2=43, ignoring multiplication precedence;
• 3.Doing (4+5)×(5-2) = 9×3 = 27 by coincidence but with wrong order.