In each of the following, determine if the estimate given in parentheses is high (higher than the actual answer) or low (lower than the actual answer). Justify your answers without computing the exact values.
a. 398 500 1200,0002
b. 8001 ÷ 398 1202
c. 10,000 ÷ 999 1102
d. 1999 ÷ 201 1102
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