Here are the filled-in blanks based on the context you've provided:
- Estimate to predict outcomes and check for accuracy.
- Multiply multi-digit numbers to model real-world situations.
- Product: the result of multiplying two or more numbers together.
- Estimate: to form an approximate opinion of worth, amount, size, or weight.
- Decimal number: a number that is written as a sum of single-digit multiples of powers of 10.
- Round: to estimate or make a number less accurate by increasing or decreasing it to a selected place value.