By leading figure estimation, approximate the value of $2692+3669$2692+3669

By leading figure estimation, approximate the value of $3620-1082$3620−1082

By leading figure estimation, approximate the value of $6534+7418+1240$6534+7418+1240

By leading figure estimation, approximate the value of $446\times54$446×54

Use a range of multiplicative strategies when operating on whole numbers