qmk_firmware/keyboards/reversestudio/decadepad/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [0] = LAYOUT_numpad_6x4(
      RGB_TOG,  RGB_MOD,  RGB_VAI,  RGB_M_R,
      KC_NUM,   KC_PSLS,  KC_PAST,  KC_PMNS,
      KC_P7,    KC_P8,    KC_P9,
      KC_P4,    KC_P5,    KC_P6,    KC_PPLS,
      KC_P1,    KC_P2,    KC_P3,    
      KC_P0,              KC_PDOT,  KC_PENT
  ) 
};