qmk-firmware/layouts/default/numpad_5x4/default_numpad_5x4/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    /*
     * ┌───┬───┬───┬───┐
     * │TG1│ / │ * │ - │
     * ├───┼───┼───┼───┤
     * │ 7 │ 8 │ 9 │   │
     * ├───┼───┼───┤ + │
     * │ 4 │ 5 │ 6 │   │
     * ├───┼───┼───┼───┤
     * │ 1 │ 2 │ 3 │   │
     * ├───┴───┼───┤Ent│
     * │   0   │ . │   │
     * └───────┴───┴───┘
     */
    [0] = LAYOUT_numpad_5x4(
        TG(1),   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
    ),

    /*
     * ┌───┬───┬───┬───┐
     * │TG1│ / │ * │ - │
     * ┌───┬───┬───┐───┤
     * │Hom│ ↑ │PgU│   │
     * ├───┼───┼───┤ + │
     * │ ← │   │ → │   │
     * ├───┼───┼───┤───┤
     * │End│ ↓ │PgD│   │
     * ├───┴───┼───┤Ent│
     * │Insert │Del│   │
     * └───────┴───┘───┘
     */
    [1] = LAYOUT_numpad_5x4(
        _______, _______, _______, _______,
        KC_HOME, KC_UP,   KC_PGUP,
        KC_LEFT, XXXXXXX, KC_RGHT, _______,
        KC_END,  KC_DOWN, KC_PGDN,
        KC_INS,           KC_DEL,  _______
    )
};