Math SuperPage 3rd Grade Mathematics: 3rd Grade Numbers Base Ten (NBT) Worksheet Drills Week 1: Estimating Products Rounding to Ten with Numberlines Rounding to Hundred with Numberlines Rounding to Tens and Hundreds Week 1 NBT Review Coming Soon Week 2: Multiple Addends Word Problems Subtracting Across Zero Add and Subtract Variables (within 1000) Multiplying Multiples of Ten Week 2 NBT Review