Directions: Using the digits 1 to 9 exactly one time each, place a digit in each box to make the sum as close to 1000 as possible.

### Hint

### Hint

How do you know you can’t get any closer to 1000? What should be true about the hundreds places of your three numbers? How do the tens places affect your answer?

### Answer

### Answer

Lots of answers will get you 999. One would be 247 + 563 + 189.

Is exactly 1000 even possible? Here’s a Geogebra tool you can use to check your answer.

Is exactly 1000 even possible? Here’s a Geogebra tool you can use to check your answer.

Source: John Ulbright and Robert Kaplinsky

One would be 189+247+563

Hi, I’m a 1st time visitor. We are just really getting started recording various levels of DOK questions within our common lessons. I found your site via a Goggle search. However, I have a question. How can I confirm if a question is a DOK 2 or 3? They do not seem to be identified. Are the levels noted somewhere?

Thanks,

Laura

Hi Laura. You can see it in the gray tags area just above the comments section. This problem is DOK 3.

600+300+100=1000

Devn, that isn’t true. You cannot use 0s.

176+534+289=999