The defendant, Remel Ahart, was convicted by a six-person jury of possession of cocaine with intent to distribute, G. L. c. 94C, § 32A(a), in a school zone, G. L. c. 94C, § 32J. On appeal, he argues that (1) the evidence introduced was only sufficient to prove possession, not intent to distribute; and (2) the substance taken from him was not the substance alluded to in the drug certificate. We affirm.

Facts. On May 28, 2002, at approximately 11:00 a.m., school officials at Arlington High School brought Ahart, a seventeen year old student, to the principal’s office, whereupon one detective and one police officer from the Arlington police department *414arrested him on an outstanding, unrelated warrant. After being patted down for weapons, Ahart was handcuffed and taken to the Arlington police station, where he was again searched. A razor blade in his front pants pocket was seized. Upon inquiry, while denying that he had any other weapons or contraband, Ahart reached into his back pants pocket with his right hand, and upon withdrawing his hand, held it in a fist. After he refused the detective’s order to open his closed hand, a brief struggle ensued, resulting in the seizure of ten individually wrapped bags, each containing a rock-like substance, which the detective recognized as “crack” cocaine. The detective also seized thirty-two dollars in cash. The State laboratory later identified the contents of the bags as cocaine.1

At trial, the Commonwealth offered as evidence the testimony of the two police officers, the razor blade, the cash, the bags of cocaine, and the accompanying certificate of analysis completed by the State laboratory in accordance with G. L. c. 111, § 13. Detective Joseph Connors of the Waltham police department was also called as an expert in the distribution and packaging of cocaine in high schools.

Connors testified, in part, about the modus operand! of high school, as opposed to street, drug dealers. While street dealers rely on pagers and cellular telephones, items often banned in schools, knowledge of drug availability there is gained via word of mouth, with the ultimate sale being consummated during a free break or at lunch. More to the point, it was also established that a high school student carrying ten individually wrapped bags of crack cocaine (with a street value of $200 to $400), possessing a razor blade but no smoking paraphernalia, at 11:00 a.m. (prior to lunch) on school grounds, is a scenario consistent with the intent to distribute drugs, as opposed to the intent to use them. Lastly, Connors testified, the razor was significant in that dealers often use razors to cut rocks of cocaine into smaller sizes prior to packaging and distribution.2

Intent to distribute. When a relatively small amount of drugs *415is at issue — here ten rocks weighing 1.87 grams — additional evidence is generally required to prove an intent to distribute. “While in some of the cases cited and relied upon by the Commonwealth lesser amounts of drugs were in issue, there was evidence in addition to the drugs themselves which was susceptible of an inference of the intent to distribute and which was inconsistent with the notion of personal use.” Commonwealth v. Wooden, 13 Mass. App. Ct. 417, 423-424 (1982). See Commonwealth v. Roman, 414 Mass. 642, 645-647 (1993), and cases cited.

In Commonwealth v. Martin, 48 Mass. App. Ct. 391, 392 (1999), the defendant was caught with eighteen individually wrapped packages of crack cocaine, weighing 2.04 grams. His conviction for possession with intent to distribute was affirmed, the court ruling that “[w]hile 2.04 grams is a small amount, the defendant’s intent to distribute could be inferred not from the amount but from the manner of packaging and the general circumstances, including the fact that the defendant was spotted at a location high in drug activity, and the vigor of his attempt to avoid apprehension — an attempt that could reasonably be thought excessive for a mere user.” Id. at 392-393. Of additional significance was the expert testimony given. Id. at 392.

In Commonwealth v. Gonzales, 33 Mass. App. Ct. 728, 731 (1992), the defendant possessed ten individually wrapped bags of heroin, totaling .32 grams. “The drugs that were seized were in ten glossine packets held together by an elastic band. Such packaging was considered to be a bundle which, according to the [expert] testimony, was consistent with distribution rather than personal use.” Ibid. Contrast Commonwealth v. Wooden, supra at 422-424 (six bags of marijuana and six bags of cocaine, weighing 23.44 and 6.63 grams respectively, insufficient); Commonwealth v. Tripp, 14 Mass. App. Ct. 997, 998-999 (1982) (eight bags standing alone insufficient).

*416Taking the totality of the circumstances into account, sufficient additional evidence, supplementing the ten bags of crack cocaine, was presented justifying the verdict of the jury. The defendant, a seventeen year old high school student, carried on his person not only drugs worth from $200 to $400 but also a razor, the use of which, according to expert testimony, enables drug dealers to cut their product. It is also significant that he was caught with the drugs at 11:00 a.m., thirty minutes before lunch, a time when, according to the expert, transactions often occur.

The defendant’s attempt to isolate each piece of the Commonwealth’s evidence as insufficient is unavailing. The sufficiency of the Commonwealth’s evidence must be viewed in its totality, not piecemeal, as the defendant suggests. See Commonwealth v. Rivera, 44 Mass. App. Ct. 452, 454 (1998) (“In view of all of the circumstances, the evidence was amply sufficient to warrant submission of the issue of the defendant’s intent to distribute the cocaine to the jury for resolution”). See also Commonwealth v. LaPerle, 19 Mass. App. Ct. 424, 429 (1985).3

Judgments affirmed.