do the math | Idiomator

Meaning: (chiefly US)To perform amathematicalcalculation.2002February 17,Amanda Hesser, “Food Diary: Local Hero”, inNew York Times, retrieved18 December 2018:Before my family left for Rome, Idid the math. Over 11 days, with a lunch and a light dinner, each of us could taste approximately 55 dishes.; (chiefly US,idiomatic)To determine theexplanationfor or precise nature of a situation, such as themotiveunderlying someone's behavior, based on available facts.2003November 16,James Poniewozik, “All The News That Fits Your Reality”, inTime, retrieved18 December 2018:Gore has looked into buying cable channel News World International. Despite initial reports, Gore's camp says he and his backers intend to make the channel not a liberal mouthpiece but a "hip" news channel.[…]Maybe; maybe not. (Gore has long complained about the undue influence of conservatives on talk radio and Fox News, so youdo the math.)2012, Racine Lavelle,Embracing the Wolf,→ISBN,page117:“The child has marks all over. I saw them when I took her to the bathroom. Ian, she is hurting this child. Now I don't know for sure what's going on here, and maybe it's none of my business. Nevertheless, even I cando the math.[…]You can't let her keep this child for one more day.”2015December 22, Mitch Smith, “Sandra Bland’s Family Calls for Criminal Charges Against Texas Trooper”, inNew York Times, retrieved18 December 2018:“I can’t tell you what we’re going back to consider,” said Darrell Jordan, a special prosecutor assigned to the case, who cited Texas law regarding grand jury secrecy. “But you cando the mathand figure out what it is.”

Examples:

EN: We'll do the math! Uncle Giovannino!
ES: ¡Arreglaremos cuentas, tío Giovannino!
EN: Tomorrow we'll do the math, Don Giovannino!
ES: ¡Mañana arreglaremos cuentas, don Giovannino!
EN: - Then we'll do the math!
ES: - ¡Luego haremos cuentas!
EN: I'll have to do the math and know what sum I have.
ES: Tendré que hacer cuentas, y saber de qué suma dispongo.
EN: 4 times, do the math well.
ES: 4 veces, lleva bien la cuenta.
EN: Congratulations on the rapidity with which you do the math.
ES: Me congratulo de la rapidez con la que haces las cuentas.
EN: Let's go to the bank immediately and do the math.
ES: Vamos al banco inmediatamente y hagamos cuentas.
EN: Excuse me, dear, you do the math.
ES: Perdona, querida, saca tú la cuenta.
EN: We'll do the math at the police station.
ES: Ya haremos cuentas en la comisaría.
EN: You can do the math just like I have for the last two years.
ES: Calcule lo que los otros pueden producir en uno o dos años.
EN: They give us 12,000, a few presents... You do the math.
ES: Doce mil que nos dan, algunos regalos, haz tú la cuenta.
EN: Well, do the math then!
ES: ¡Cuente pues!
EN: Goodnight, then let's do the math!
ES: ¡Buenas noches, ya ajustaremos cuentas!
EN: I will pay for everything and we will do the math later.
ES: Pagaré por todo y luego haremos los cálculos.
EN: I'll do the math.
ES: Yo haré la cuenta.

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