365 + 99 = - 464, 5678 + 9 = - 5687, 345 + 98 = - 443, 97 + 267 - 364, 299 + 456 - 755, 5999 + 321 - 6320, 499 + 678 - 1177, 345 + 98 = - 443, 398 +324 =  - 722, 4567 + 2999 - 7566,

mental addition

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