What a brilliant site you have!!! I love it, especially as it saves me hours and hours of hard work. Others who haven't found your site yet don't know what they are missing!
3.OA.4 – Determine the unknown whole number in a multiplication or division equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 × ? = 48, 5 = _ ÷ 3, 6 × 6 = ?
Samples: 2x-10x Multiplication facts - Missing Number. Division Facts - missing number - activity 1.
3.OA.6 – Understand division as an unknown-factor problem. For example, find 32 ÷ 8 by finding the number that makes 32 when multiplied by 8.
Samples: Division Facts - missing number - activity 1. 2x-10x Multiplication facts - Missing Number.
Number and place value
ACMNA100 – Solve problems involving multiplication of large numbers by one- or two-digit numbers using efficient mental, written strategies and appropriate digital technologies
Samples: 11x Multiplication facts (times tables). 12x Multiplication facts (times tables). Multiplying by 10.
6.NA.3 – Describe spatial and number patterns, using:
6.NA.3.b – Rules that involve spatial features, repeated addition or subtraction, and simple multiplication.
Samples: Addition two Digit - Missing Numbers. Addition Make 100. Make 100. Challenge puzzle. Addition Of Five Digit Numbers.