estimate: 90-78 - 10, estimate: 70-46 - 20, estimate: 13+15 - 30, estimate: 27+64 - 90, estimate: 50-8 - 40, estimate: 8+38 - 50, estimate: 90-23 - 70, estimate: 23+38 - 60, estimate: 103 + 118 - 220, estimate: 29 + 49 - 80,

Check-Up (1-5): Estimating difference and sum

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