1. © Hamilton Trust Keeping Up Term 3 Week 1 Day 3 Objective: Use rounding to estimate answers to calculations.

2. © Hamilton Trust Keeping Up Term 3 Week 1 Day 3 Making an estimate can help us to be accurate when calculating or in making an approximation. How would you approximate the answer to this addition? How might rounding help us make a close estimate?

3. © Hamilton Trust Keeping Up Term 3 Week 1 Day 3 How would you approximate the answer to this subtraction? Hint! Count up to subtract

4. © Hamilton Trust Keeping Up Term 3 Week 1 Day 3 Use rounding to help estimate the sum and difference between these two numbers. Compare your answers with a partner… Are they the same? Have you used different rounded numbers?

5. © Hamilton Trust Keeping Up Term 3 Week 1 Day 3 How could you approximate the answers to each of these multiplications?

6. © Hamilton Trust Keeping Up Term 3 Week 1 Day 3 Challenge 1 Find three multiplications (tens x ones) with answers between 200 and 300; no zeros allowed in your numbers! Challenge 2 Find three multiplications (tens x ones) with answers between 650 and 750; no zeros allowed in your numbers!