Three-digit × one-digit

Split the three-digit number into hundreds, tens and ones. Multiply each part by the one-digit number, then add: 347 × 6 → 300 × 6 = 1800, 40 × 6 = 240, 7 × 6 = 42, 1800 + 240 + 42 = 2082. A place with a 0 needs no multiplying: 305 × 4 → 300 × 4 = 1200, 5 × 4 = 20, 1200 + 20 = 1220. If the one-digit number comes first, nothing changes: 6 × 347 has the same product as 347 × 6. Estimate first to check: 347 is near 350, and 350 × 6 = 2100, so the answer should be near 2100. Another way is to multiply in columns from the ones, carrying into the next place: 7 × 6 = 42, write 2 carry 4; 4 × 6 + 4 = 28, write 8 carry 2; 3 × 6 + 2 = 20 → 2082.