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# Number & Operations in Base Ten

## Close to 1000

Directions: Arrange the digits 1-9 into three 3-digit whole numbers. Make the sum as close to 1000 as possible. Source: John Ulbright and Robert Kaplinsky

## Sums to 100

Directions: Create the closest possible sum to 100 by filling in the boxes using the whole numbers 1-9 no more than one time each. Source: Graham Fletcher

## Subtraction without Regrouping

Directions: Fill in the boxes so that you would not need to regroup when you subtract. Make sure your number is less than 63. Extension: Explain why you do NOT need to regroup using your number. Source: Chase Orton

Directions: Make the smallest (or largest) sum by filling in the boxes using the whole numbers 1-9 no more than one time each. Source: Robert Kaplinsky

## Subtracting Two-Digit Numbers (Elementary)

Directions: Make the smallest (or largest) difference by filling in the boxes using the whole numbers 1-9 no more than one time each Source: Robert Kaplinsky