Grade 5 Math Worksheets: Multiply in parts (1 by 3-digit) - K5 Learning Below are six versions of our grade 5 math worksheet on multiplying 1-digit by 3-digit numbers. Use mental math! These worksheets are pdf files. Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4 Worksheet #5 Worksheet #6 5 More Similar: Multiply 1-digit numbers by numbers near 100 Multiply 1 & 2-digit numbers More division worksheets