4-D.20 Multiply a 2-digit number by a 2-digit number: word problems

4-E.11 Divide larger numbers by 1-digit numbers: word problems

4-E.11 Divide larger numbers by 1-digit numbers: interpret remainders

4-F.2 Addition, subtraction, multiplication, and division word problems

4-F.4 Word problems with extra or missing information

4-F.6 Multi-step word problems

4-A.15 Prime and composite - up to 100

4-D.9 Multiplication patterns over increasing place values

4-D.30 Multiplication input/output tables

4-E.13 Division patterns over increasing place values

4-L.7 Use a rule to complete a number pattern

Khan Academy Mappers

Khan Academy: Multi-Digit Multiplication

Khan Academy: Estimating Multi-Digit Division

Khan Academy: Strategies for Dividing Multiples of 10, 100, 1000

Khan Academy: Prime and Composite Numbers

D64 Student Video: Long Division