1. © 2007 M. Tallman A Mental Math Strategy

2. © 2007 M. Tallman 96 + 268 + 4 - 4 100 264 + = 364 Step 1: 96 is close to 100; 100 is a much easier number to work with. Step 2: Add 4 to 96 to make it 100. Step 3: Subtract 4 from the other addend, 268. Step 4: Add 100 and 264 mentally.

3. 134 + 494 - 6 + 6 128 500 + = 628 Step 1: 494 is close to 500; 500 is a much easier number to work with. Step 2: Add 6 to 494 to make it 500. Step 3: Subtract 6 from the other addend, 134. Step 4: Add 128 and 500 mentally.

4. 185 + 117 + 15 - 15 200 102 + = 302 Step 1: 185 is close to 200; 200 is a much easier number to work with. Step 2: Add 15 to 185 to make it 200. Step 3: Subtract 15 from the other addend, 117. Step 4: Add 200 and 102 mentally.

5. 456 + 130 - 6 + 6 450 136 + = 586 Step 1: 456 is close to 450; 450 is an easier number to work with. Step 2: Subtract 6 to 456 to make it 450. Step 3: Add 6 to the other addend, 130. Step 4: Add 450 and 136 mentally.

6. 141 + 708 + 8 - 8 149 700 + = 849 Step 1: 708 is close to 700; 700 is a much easier number to work with. Step 2: Subtract 8 from 708 to make it 700. Step 3: Add 8 to the other addend, 141. Step 4: Add 141 and 700 mentally.

7. A Mental Math Strategy

8. © 2007 M. Tallman 131 400 + 864 131 + 531 60 531 + 591 8 591 + 599

9. © 2007 M. Tallman 457 300 + 673 457 + 757 70 757 + 827 6 827 + 833