MATH-SAYA

What comes next to 46?

Solve the expression

11 - 1 + 12 - 2 + 13 - 3 + 14 - 4 + 15 - 5 + 16 - 7.

What is the missing number in the following sequence

1,4,5,8,9,12,13, _, 17, 20,21?

• 14

• 15

• 16

Alex has 20 crayons and Mika has 4 crayons more than Alex.

What is the total number of crayons Alex and Mika have?

In 6 years, Alex will be twice his current age. How old is Alex now?

The product of 5 whole numbers is 3. What is the sum of these numbers?

• 6

• 7

• 8

Sabrina added the numbers 1, 2, 3, 5, and 9 correctly. Her cousin Diana added the numbers 2, 4, 7, and 10 correctly. By how much is Diana's sum greater than Sabrina's sum?

Nick has 18 pencils. Peter has half as many pencils as Nick. By how many are Nick's pencils more than Peter's?

• 9

• 10

• 8

How many of the numbers from 7 to 13 can we present as the sum of two or three equal addends?

How many two-digit numbers do NOT contain the digit 0?