diff --git a/src/task_1/index.js b/src/task_1/index.js
index f17c848..2c88871 100644
--- a/src/task_1/index.js
+++ b/src/task_1/index.js
@@ -7,6 +7,49 @@
  */
 
 function numeralSum(number) {
+    if (typeof number === "number") {
+        let summ = 0;
+        if (number < 0 && Number.isInteger(number) && isFinite(number)) {
+            number *= -1;
+            let str = String(number).split('');
+            for (let i = 0; i < str.length; i++) {
+                summ += Number(str[i]);
+            }
+            return summ;
+        } else if (number < 0 && !Number.isInteger(number) && isFinite(number)){
+            number *= -1;
+            let str = String(number).split('');
+            for (let i = 0; i < str.length; i++) {
+                if (str[i] == "."){
+                    false
+                } else {
+                    summ += Number(str[i]);
+                }
+            }
+            return summ;
+        } else if (number > 0 && !Number.isInteger(number) && isFinite(number)){
+            let str = String(number).split('');
+            for (let i = 0; i < str.length; i++) {
+                if (str[i] == "."){
+                    false
+                } else {
+                    summ += Number(str[i]);
+                }
+            }
+            return summ;
+        } else if (!isFinite(number) && !isNaN(number)) {
+            return summ = Infinity;
+        } else if (isNaN(number)){
+            return summ = number;
+        } else {
+            let str = String(number).split('');
+            for (let i = 0; i < str.length; i++) {
+                summ += Number(str[i]);
+            }
+            return summ;
+        }
+    }
 }
 
+
 module.exports.numeralSum = numeralSum;
diff --git a/src/task_2/index.js b/src/task_2/index.js
index 98c02f5..aba031b 100644
--- a/src/task_2/index.js
+++ b/src/task_2/index.js
@@ -6,6 +6,13 @@
 @return {string} Строка формата Фамилия И.О.
  */
 function fioFormat(inputFio) {
+    if (typeof inputFio == "string") {
+        let arrStr = inputFio.split(' ')
+        arrStr[0] = `${arrStr[0].substr(0, 1)}.`
+        arrStr[2] = `${arrStr[2].substr(0, 1)}.`
+        let str = `${arrStr[1]} ${arrStr[0]} ${arrStr[2]}`
+        return str
+    }
 }
 
 module.exports.fioFormat = fioFormat;
diff --git a/src/task_3/index.js b/src/task_3/index.js
index a5bc939..0ca8d79 100644
--- a/src/task_3/index.js
+++ b/src/task_3/index.js
@@ -7,6 +7,19 @@
 @return {number} Количество лет
  */
 function countAge(birthYear) {
+    let currentY = new Date().getFullYear();
+    try {
+        if (typeof birthYear !== "number" 
+            || birthYear < 0 
+            || !isFinite(birthYear) 
+            || !Number.isInteger(birthYear)
+            || birthYear > currentY) {
+            throw new SyntaxError("Неверный формат даты.");
+        }
+        return currentY - birthYear;
+    } catch (e) {
+        alert("Error: " + e.message);
+    }
 }
 
 module.exports.countAge = countAge;
diff --git a/src/task_4/index.js b/src/task_4/index.js
index 5db003b..96f3628 100644
--- a/src/task_4/index.js
+++ b/src/task_4/index.js
@@ -6,6 +6,14 @@
 @return {number} Среднее арифмитическое чисел в строке
  */
 function average(numbersString) {
+    let arrStr = numbersString.split(",");
+    let arrNum = arrStr.map(el => Number(el));
+    let sum = 0;
+    for (let i=0; i<arrNum.length; i++) {
+        sum += arrNum[i];
+    }
+    let avg = sum/arrNum.length;
+    return avg;
 }
 
 module.exports.average = average;
diff --git a/src/task_5/index.js b/src/task_5/index.js
index 6c7b26f..23b3797 100644
--- a/src/task_5/index.js
+++ b/src/task_5/index.js
@@ -8,6 +8,13 @@ value - значение, которое содержится в поле key и
 @return {Array} Массив вида [[key, value], [key, value], ...]
  */
 function makePairs(object) {
+    if (typeof object == "object") {
+        let arr = new Array;
+        for (let key in object) {      
+            arr.push([key, object[key]])
+        }
+        return arr
+    }
 }
 
 module.exports.makePairs = makePairs;