# ADDITION AND SUBTRACTION OF TENS AND ONES-P.1

##### This unit is about addition and subtraction of Tens and Ones

Adding 2 digit numbers to 2 digits (without re –grouping)

Examples

Activity: Re – arranging the sums in Tens and Ones and adding correctly.

– Word problems involving addition of Tens and Ones

e.g. a) Jane has 13 eggs. Ruth has 4 eggs. How many eggs do they have altogether? = 13 + 4 =

b) James has 22 oranges. Ann has 15 oranges. How many oranges do they have altogether? = 22 + 15 = _____

Activity: Re – arranging the sums in Tens and Ones and adding correctly.

Operations of number (subtraction)

• Subtraction of numbers less than 20 both vertically and horizontally
• Subtracting and counting

e.g.

Word problems involving subtraction

• Reading, interpreting, subtracting, writing, forming word problems.

e.g. a) 2 mats – 1 mat =______ mat

b) James had 8 shirts. He gave 4 shirts to Peter. How many shirts remained? = 8 – 4 = ______. He remained with ______ shirts.

Subtraction of Tens and Ones

Subtracting 1 digit number from 2 digits (without re –grouping)

T O   O                         T O   O

e.g. a) 3 6 – 4 = 32           b)   8   5 – 3 = 82

Activity: Re – arranging the sums in Tens and Ones and subtracting correctly.

Subtracting 2 digit numbers from 2 digits (without re –grouping).

Activity: Re – arranging the sums in Tens and Ones and subtracting correctly.

Subtraction of Tens and Ones

– Word problems involving subtraction of Tens and Ones

e.g. a) Tim has 25 mangoes. 4 of them are raw. How many mangoes are ripe? 25 – 4 = ___

b) Joy had 44 books. She gave 10 books to her teacher. How many books did she remain with? = 44 – 10 = ____

Activity: Re – arranging the sums in Tens and Ones and adding correctly.

Subtracting numbers less than 20 on a number line

• Drawing a number line
• Subtracting numbers on a number line

e.g. 6 – 2 = ___4_

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