4. Multiples of 10
Students use their knowledge of multiplication within 100 to multiply multiples of 10. For example, they can use the knowledge of 8 x 8 = 64 to arrive at 8 x 80 = 640.
Common Core Alignment
4.NBT.5Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.