Mental Math and Calculation Strategies

The video tutorial introduces mental math strategies for addition and subtraction, emphasizing the use of number sense rather than counting. It covers the concept of tidy numbers, which involves making multiples of ten, and the doubling strategy for quick addition. The tutorial also explains subtraction strategies, highlighting the inverse relationship between addition and subtraction and using tidy numbers as a bridge for easier calculations.

What is the primary goal of mental math as defined in the video?

• To memorize all math facts

• To use number sense without counting by ones or twos

• To count on fingers for accuracy

• To use calculators for quick calculations

What is the term used for breaking numbers into parts to make calculations easier?

• Multiplying

• Dividing

• Subtracting

• Partitioning

How can you make the number 70 a tidy number?

• Add 50

• Add 10

• Add 30

• Add 20

If 7 + 7 equals 14, what is 7 + 8?

• 14

• 13

• 15

• 16

What is the result of doubling 70?

• 130

• 140

• 120

• 150

What is the inverse operation of addition?

• Doubling

• Subtraction

• Multiplication

• Division

If 15 - 7 equals 8, what should 8 + 7 equal?

• 20

• 12

• 15

• 10

What is the strategy called when using 10 as a bridge in subtraction?

• Using addition

• Using tidy numbers

• Doubling

• Partitioning

How would you simplify 48 - 29 using partitioning?

• Subtract 30, then add 1

• Subtract 20, then 8, then 1

• Subtract 10, then 19

• Subtract 40, then add 11

What is the result of 48 - 29 using the partitioning method?

• 18

• 19

• 21

• 20